Multiplying Two-Digit Numbers with Grid Method
Learn how to multiply two-digit numbers using the grid method, step-by-step illustrations show the process for solving multiplication problems like 73 x 58 and 71 x 43. Practice exercises like 124 x 45 demonstrate how to apply the grid method to three-digit numbers.
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Presentation Transcript
8/1/21 LO: To multiply a two digit number by another two digit number using the Grid Method.
Warm up 23 x 10 = 230 We already know that when you multiply a number by 10 you shift all the digits __________ space to the _______________ and insert a placeholder zero. one left
Today we are going to use the grid method to multiply two 2 digit numbers together Why do you think we call it the grid method?
How might you solve this calculation? 73 x 58=
We can use the grid method X 70 3 50 8
We can use the grid method X 70 3 50 3500 150 3650 + 584 8 560 24 4234
Step 1: partition the numbers 25 x 35= 20 + 5 30 + 5 X 20 5 30 5
25 x 35= X 20 5 600 6 15 150 30 10 100 25 5
What next? 25 x 35= X 20 5 6 0 0 1 5 0 1 0 0 2 5 7 8 30 600 150 + 5 100 25 5
Try this one Use the Grid Method of multiplication to work out this question 71 x 43 =
71 x 43 = X 70 1 28 2800 40 40 21 210 3 3
71 x 43 = 2 8 0 0 2 1 0 X 70 1 4 0 + 3 28 2800 40 40 2 0 0 0 1 0 0 0(800 + 200) 5 0 (2000 + 0) 21 210 3 3 (10 + 40) + 3 (3 + 0) 3 0 5 3
Can you multiply three digit numbers? How would you set this one out? 124 x 45 =
4 0 0 0 8 0 0 1 6 0 5 0 0 1 0 0 124 x 45 = X 100 20 4 40 4000 800 160 + 2 0 4 0 0 0 1 5 0 0(800+100+100+500) 8 0 5 5 8 0 5 500 100 20 (4000 + 0) + (60+20)
Assessment Using the Grid Method of multiplication, work out the answer to these: 1. 146 x 25 2. 560 x 28 3. 245 x 152
Assessment Answers 800 120 200 30 1150 10000 1200 4000 480 15680 Q1 40 6 Q2 500 60 20 10000 1200 20 800 120 8 4000 480 5 200 30 20000 4000 500 10000 2000 250 400 Q3 200 40 5 100 20000 4000 500 50 10000 2000 250 2 400 80 10 80 10 37240
LO: I can multiply a two digit number by another two digit number using the Grid Method. Section A Section B Q1) 92 x 50 = Q1) 92 x 139 = Q2) 18 x 98 = Q2) 87 x 166 = Q3) 17 x 87 = Q3) 82 x 185 = Q4) 58 x 39 = Q4) 66 x 158 = Q5) 53 x 44 = Q5) 46 x 136 = Q6) 22 x 70 = Q6) 28 x 102 = Q7) 51 x 32 = Q7) 93 x 165 = Q8) 43 x 71 = Q8) 99 x 151 = Q9) 93 x 68 = Q9) 64 x 191 = Q10) 21 x 53 = Q10) 21 x 117 = Section C Q1) 155 x 497 = Q2) 119 x 517 = Q3) 101 x 227 = Q4) 109 x 141 = Q5) 122 x 642 = Q6) 114 x 363 = Q7) 180 x 301 = Q8) 169 x 316 = Q9) 109 x 578 = Q10) 116 x 197 = Q11) 157 x 367 = Q12) 188 x 176 = Q13) 175 x 258 = Q14) 121 x 417 = Q15) 159 x 378 = Q16) 150 x 533 = Q17) 132 x 126 = Q18) 120 x 538 = Q19) 145 x 601 = Q20) 152 x 922 = Section D Q1) A baker bakes twenty doughnuts per day, how many does he bake in a 2weeks? Q2) Sam bought 138 rolls of paper. Each roll was 34m long. How long is it altogether? Q3) Tom collected 57 stamps a week for 2 years. How many stamps did he collect? Q4) Niamh eats 246 apples a year. How many does she eat in twelve years? Q5) A Garden is 20m wide and its length is 187m. What is its total area? Q6) Mr Senior swims 48 lengths a week, how many lengths does he swim a year? Q7) If Fanta is packed in boxes of 67, how many cans will there be in 25 boxes? Q8) Mrs Haddleton runs 12 laps of the field a week. How many laps in 3.5 years?
Answer Key Section B 92x 139 = 12788 87x 166 = 14442 82x 185 = 15170 66x 158 = 10428 46x 136 = 6256 28x 102 = 2856 93x 165 = 15345 99x 151 = 14949 64x 191 = 12224 21x 117 = 2457 Section A 92 x 50 = 4600 18 x 98 = 1764 17 x 87 = 1479 58 x 39 = 2262 53 x 44 = 2332 22 x 70 = 1540 51 x 32 = 1632 43 x 71 = 3053 93 x 68 = 6324 21 x 53 = 1113 Section C 155x 497 = 77035 119x 517 = 61523 101x 227 = 22927 109x 141 = 15369 122x 642 = 78324 114x 363 = 41382 180x 301 = 54180 169x 316 = 53404 109x 578 = 63002 116x 197 = 22852 157x 367 = 57619 188x 176 = 33088 175x 258 = 45150 121x 417 = 50457 159x 378 = 60102 150x 533 = 79950 132x 126 = 16632 120x 538 = 64560 145x 601 = 87145 152x 922 = 140144 Q1) Q2) Q3) Q4) Q5) Q6) Q7) Q8) Q9) Q10) Q1) Q2) Q3) Q4) Q5) Q6) Q7) Q8) Q9) Q10) Q1) Q2) Q3) Q4) Q5) Q6) Q7) Q8) Q9) Q10) Q11) Q12) Q13) Q14) Q15) Q16) Q17) Q18) Q19) Q20) Section D 20 x 14 =280 138 x 34 =4692 57 x (52 x 2) =5928 246 x 12 =2952 187 x 20 =3740 48 x 52 =2496 67 x 25 =1675 12 x 182 =2184 Q1) Q2) Q3) Q4) Q5) Q6) Q7) Q8)
