Effective Addition Strategies for Mathematical Problems

 
Addition Strategies
Addition Strategy
Add Up In Chunks
Keep the first number whole, add the second number in friendly chunks
 
23
 
+ 
1
2
 
+10        
+2
 
 
23
 
33
35
Addition Strategy
Add Up In Chunks
Keep the first number whole, add the second number in friendly chunks
 
209
 
+ 
1
2
4
 
+100      
+20 
+1   +3
 
 
209
 
309
 
329
 
330
333
Addition Strategy
Place Value
Partition the numbers and add by the place value
 
2
1
 + 
1
4
 
20
   1
    
10
     
4
20 
+ 
10 
=
 30
1 
+
 4 
=
 5
30 + 
5
 = 35
 
 
Addition Strategy
Place Value
Partition the numbers and add by the place value
 
1
2
4
 + 
2
3
5
 
100 
+ 
200 
=
 300
20 
+
 30 
=
 50
4 
+
 5 
= 
9
300 
+
 
50 
+ 
9
 = 359
 
 
Addition Strategy
Compensation
Make friendly numbers by removing from one number
and adding the same amount to the other number
 
17 + 19
-1     +1
 
 
 
16 + 20 = 36
Addition Strategy
Compensation
Make friendly numbers by removing from one number
and adding the same amount to the other number
 
135 + 118
-2      +2
 
 
 
133 + 120 = 253
Addition Strategy
Making a Ten/Bridging Through Ten
Make a ten by partitioning a number
 
1
8 
+ 6
 
 
10 + (
8
 + 
2
) = 
20
20 
+
 
4
 
= 24
 
2
   
4
Addition Strategy
Making a Ten/Bridging Through Ten
Make a ten by partitioning a number
 
13
7 
+ 118
 
130 + 110 + (
7
 + 
3
) + 
5
240 + (
7
 + 
3
) +
 5
250
 
+
 
5
 
= 255
 
3
   
5
Addition Strategy
Near Doubles
Knowing Doubles helps with Near Doubles
 
25 + 26
25 + 26 = 
25
 + (
25
 + 
1
)
 
 
50
 + 
1
 = 51
 
25
25
1
Addition Strategy
Near Doubles
Knowing Doubles helps with Near Doubles
 
340 + 330
 
340 + 330 = 
340
 + (
340
 - 
10
)
 
680
10
 = 670
 
 
Subtraction Strategies
Subtraction Strategy
Removal
Partition to remove the number within the subtraction.
 
22
8
 = 14
 
-6           -2
 
 
14
 
20
 
22
Subtraction Strategy
Removal
Partition to remove the number within the subtraction.
 
132
47
 = 14
 
 
 
85
 
100
 
132
 
-15
 
-32
Subtraction Strategy
Add Up
Partition to add from the lowest number to the highest number
 
50
39
 
 
 
39
 
40
 
50
 
+1
 
+10
 
1 
+ 
10
 = 
11
Subtraction Strategy
Add Up
Partition to add from the lowest number to the highest number
 
123
68
 
 
 
68
 
70
 
100
 
+2
 
+30
 
2 
+ 
30 + 23
 = 
55
 
123
 
+23
Subtraction Strategy
Place Value Subtraction and
Negative Numbers
Partition and subtract using place value
 
7
5
3
8
 
70 
 30 
=
 
40
5
 
 
8
 
=
 -3
40 –
 
3 
=
 37
Subtraction Strategy
Place Value Subtraction and
Negative Numbers
Partition and subtract using place value
 
2
4
3
1
6
9
200 
 100 
= 
100
40 
 60 
=
 
-20
3
 
 
9
 
=
 -6
100 – 20 –
 
6 
=
 74
Subtraction Strategy
Keeping a Constant Difference
Adjust both numbers in the same way to create a friendly number
to keep the difference constant.
 
53
29 
= 
54 
30 
= 24
 
 
 
29
 
30
 
53
 
54
Subtraction Strategy
Adjust One Number to Create an
Easier Problem
Adjust one number to make a friendly number
 
43 – 
29
 
 
+1
 
43
 
 
30 
= 
13
 
13
 + 1 
= 14
 
Multiplication Strategies
Multiplication Strategy
Repeated Addition
Repeat the addition of one factor by the number of times the other factor
 
4 x 
9
 
 
0
 
9
 
18
 
27
 
36
 
+9
 
+9
 
+9
 
+9
Multiplication Strategy
Making Friendly Numbers
Partition to use a friendly number to solve a more challenging problem
 
3 x 37
 
 
 
(3 x 
40
)
 
(3 x 
3
)
 
3 x 
40 
=
 
120
3 x 
3
 = 
9
120 
-
 9 
= 111
 
-
6
Multiplication Strategy
Partial Products
Partition one factor using place value and use distributive property to multiply
 
6 x 
3
2
5
6 x (
300
 + 
20
 + 
5
)
 
 
 
1800 + 120 + 30 = 1950
1800
120
30
 
6
 
300
 
20
 
5
6
Multiplication Strategy
Breaking Factors into Smaller Factors
Break a factor into smaller factors and apply the associative property
 
8
 x 
25
 
So… 
2 
x 
4 
x 
25 
=
 
2 
x 
100 
= 200
6
Multiplication Strategy
Doubling and Halving
Double one factor and halve the other to simplify a problem
 
 
 
 
4
 
125
 
4
 x 
125
 
=
 2
 x 
250
 
2
 
250
 
=
 1
 x 
500
 
1
 
500
 
=
 
500
 
Division Strategies
 
0
 
4
 
8
 
12
 
-4
 
-4
 
-4
 
3
 
9
 
49
 
89
 
129
 
-40
 
-40
 
-40
 
3 R9
6
56
 
4
40
16
 
Think…
 
4
 
10
 
4
 
+
 
14
 
=
6
58
 
4
40
16
 
Think…
 
4
 
10
 
4
 
+
 
14 R2
 
=
2
6
6
Division Strategy
Proportional Reasoning
Divide the dividend and the divisor by the same amount to simplify the problem
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Explore various addition strategies such as adding up in chunks, using place value, compensation, making a ten/bridging through ten, and leveraging near doubles. These methods provide a practical approach to solving addition problems efficiently and accurately by breaking down numbers and manipulating them strategically. Enhance your basic math skills with these useful techniques.

  • Addition strategies
  • Math
  • Mathematics
  • Learning
  • Calculation

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  1. Addition Strategies

  2. Addition Strategy Add Up In Chunks Keep the first number whole, add the second number in friendly chunks 23 + 12 +10 +2 23 33 35

  3. Addition Strategy Add Up In Chunks Keep the first number whole, add the second number in friendly chunks 209 + 124 +100 +20 +1 +3 329330 209 309 333

  4. Addition Strategy Place Value Partition the numbers and add by the place value 21 + 14 20 1 10 4 20 + 10 = 30 1 + 4 = 5 30 + 5 = 35

  5. Addition Strategy Place Value Partition the numbers and add by the place value 124 + 235 100 + 200 = 300 20 + 30 = 50 4 + 5 = 9 300 + 50 + 9 = 359

  6. Addition Strategy Compensation Make friendly numbers by removing from one number and adding the same amount to the other number 17 + 19 -1 +1 16 + 20 = 36

  7. Addition Strategy Compensation Make friendly numbers by removing from one number and adding the same amount to the other number 135 + 118 -2 +2 133 + 120 = 253

  8. Addition Strategy Making a Ten/Bridging Through Ten Make a ten by partitioning a number 18 + 6 2 4 10 + (8 + 2) = 20 20 + 4 = 24

  9. Addition Strategy Making a Ten/Bridging Through Ten Make a ten by partitioning a number 137 + 118 3 5 130 + 110 + (7 + 3) + 5 240 + (7 + 3) + 5 250 + 5 = 255

  10. Addition Strategy Near Doubles Knowing Doubles helps with Near Doubles 25 + 26 25 + 26 = 25 + (25 + 1) 1 25 25 50 + 1 = 51

  11. Addition Strategy Near Doubles Knowing Doubles helps with Near Doubles 340 + 330 340 + 330 = 340 + (340 - 10) 680 10 = 670

  12. Subtraction Strategies

  13. Subtraction Strategy Removal Partition to remove the number within the subtraction. 22 8 = 14 -6 -2 20 22 14

  14. Subtraction Strategy Removal Partition to remove the number within the subtraction. 132 47 = 14 -32 -15 132 85 100

  15. Subtraction Strategy Add Up Partition to add from the lowest number to the highest number 50 39 1 + 10 = 11 +1 +10 50 3940

  16. Subtraction Strategy Add Up Partition to add from the lowest number to the highest number 123 68 +2 +30 2 + 30 + 23 = 55 +23 6870 100 123

  17. Subtraction Strategy Place Value Subtraction and Negative Numbers Partition and subtract using place value 75 38 70 30 = 40 5 8 = -3 40 3 = 37

  18. Subtraction Strategy Place Value Subtraction and Negative Numbers Partition and subtract using place value 243 169 200 100 = 100 40 60 = -20 3 9 = -6 100 20 6 = 74

  19. Subtraction Strategy Keeping a Constant Difference Adjust both numbers in the same way to create a friendly number to keep the difference constant. 53 29 = 54 30 = 24 5354 2930

  20. Subtraction Strategy Adjust One Number to Create an Easier Problem Adjust one number to make a friendly number 43 29 +1 43 30 = 13 13 + 1 = 14

  21. Multiplication Strategies

  22. Multiplication Strategy Repeated Addition Repeat the addition of one factor by the number of times the other factor 4 x 9 +9 +9 +9 +9 0 18 27 9 36

  23. Multiplication Strategy Making Friendly Numbers Partition to use a friendly number to solve a more challenging problem 3 x 37 - (3 x 3) (3 x 40) 3 x 40 = 120 3 x 3 = 9 120 - 9 = 111

  24. Multiplication Strategy Partial Products Partition one factor using place value and use distributive property to multiply 6 x 325 6 x (300 + 20 + 5) 300 6 20 5 6 30 1800 120 1800 + 120 + 30 = 1950

  25. Multiplication Strategy Breaking Factors into Smaller Factors Break a factor into smaller factors and apply the associative property 8 x 25 6 So 2 x 4 x 25 = 2 x 100 = 200

  26. Multiplication Strategy Doubling and Halving Double one factor and halve the other to simplify a problem 4 x 125 = 2 x 250 = 1 x 500 = 500 4 6 125 2 250 1 500

  27. Division Strategies

  28. Division Strategy Repeated Subtraction Repeat the subtraction of the divisor until the difference is less than the divisor 12 4 -4 -4 -4 3 0 8 12 4

  29. Division Strategy Repeated Subtraction Repeat the subtraction of the divisor until the difference is less than the divisor 129 40 -40 -40 -40 3 R9 9 89 129 49

  30. Division Strategy Partial Quotients Partition the dividend into parts easily divisible by the divisor 56 4 4 + (16 4) 56 6 Think (40 4) 4 40 10 16 4 14 + =

  31. Division Strategy Partial Quotients Partition the dividend into parts easily divisible by the divisor 58 4 4 + (16 4) + 2 58 6 Think (40 4) 4 40 10 16 4 2 + = 14 R2

  32. Division Strategy Multiplying Up Use the multiples of the divisor to find the total dividend 65 5 5 x 10 = 50 5 x 3 = 15 5 x 13 = 65 6 65 5 = 13

  33. Division Strategy Proportional Reasoning Divide the dividend and the divisor by the same amount to simplify the problem 192 8 2 2 ??? ? =?? ?=?? = 96 4 2 = 48 2 2 = 24 1 = 24 ?= ?? 6 2 2

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