Math Mastery and Exchange Calculations
1.21 Algorithms: column subtraction
Representations | Year 3
Number, Addition and Subtraction
How to use this presentation
You can find the teacher guide
1.21 Algorithms: column
subtraction
by following the link below.
1.21 Algorithms: column subtraction – step 1:2
1.21 Algorithms: column subtraction – step 1:2
23
42
1.21 Algorithms: column subtraction – step 1:4
1.21 Algorithms: column subtraction – step 1:6
?
52
45
936
425
511
?
97
1.21 Algorithms: column subtraction – step 1:6
1
6
1
1.21 Algorithms: column subtraction – step 2:1
2
tens
3
ones
23
23
1
ten
13
ones
?
?
?
?
1.21 Algorithms: column subtraction – step 2:2
94
−
6 =
88
1.21 Algorithms: column subtraction – step 2:3
94
8
8
−
8
1
−
6
= 88
1.21 Algorithms: column subtraction – step 2:4
223 =
200
+
20
+
3
100
+
120
+
3
100
+
110
+
13
= 81
1.21 Algorithms: column subtraction – step 2:5
223
−
142
1.21 Algorithms: column subtraction – step 2:6
0
8
1
−
1
1
1.21 Algorithms: column subtraction – step 2:7
1
4
7
−
3
1
9
1
1.21 Algorithms: column subtraction – step 2:8
Which calculations require exchange?
1.21 Algorithms: column subtraction – step 2:8
Which calculations require exchange only once?
1.21 Algorithms: column subtraction – step 2:8
Which calculations require exchange twice?
1.21 Algorithms: column subtraction – step 2:8
Which calculations require exchange through a zero?
1.21 Algorithms: column subtraction – step 2:9
1
3
3
The world of math mastery through engaging visuals and challenging exchange calculations. Delve into the concepts of tens, ones, addition, and exchanges at various levels of complexity. Discover which calculations require exchange and how many times exchange is needed to solve them. Enhance your mathematical skills and problem-solving strategies with this interactive learning resource.
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Presentation Transcript
97 936 52 45 ? 511 ? 425 www.ncetm.org.uk/masterypd
3 5 6 1 1 3 2 3 4 www.ncetm.org.uk/masterypd
23 23 2 1 ? 13 3 ? ? ? tens ten ones ones www.ncetm.org.uk/masterypd
94 6 = 88 www.ncetm.org.uk/masterypd
10s 9 1s 4 6 8 8 1 8 94 6 = 88 www.ncetm.org.uk/masterypd
223 = 200 100 100 + + + 20 120 110 + + + 3 3 13 www.ncetm.org.uk/masterypd
223 142 = 81 www.ncetm.org.uk/masterypd
100s 2 1 0 10s 2 4 8 1s 3 2 1 1 1 www.ncetm.org.uk/masterypd
100s 4 2 1 10s 0 5 4 1s 4 7 7 3 1 9 1 www.ncetm.org.uk/masterypd
Which calculations require exchange? www.ncetm.org.uk/masterypd
Which calculations require exchange only once? www.ncetm.org.uk/masterypd
Which calculations require exchange twice? www.ncetm.org.uk/masterypd
Which calculations require exchange through a zero? www.ncetm.org.uk/masterypd
5 7 3 1 3 8 3 5 4 www.ncetm.org.uk/masterypd
