| Written calculations: multiplication - Maths - 15/8/2008
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It is important that children develop mental recall of multiplication tables and associated division facts. By Year 2 they should know by heart facts for the 2 and 10 multiplication tables. By Year 3 they should know by heart facts for the 2,5 and 10 multiplication tables. By Year 4 they should know by heart facts for the 2, 3, 4, 5 and 10 multiplication tables.
Progress to 2 digit numbers x by a single digit number through partitioning:
23 x 6 = (20 x 6) + (3 x 6)
= 120 + 18
= 138
Leading to the grid method of recording:
23 x 6
X 20 3
6 120 8
120 + 18 = 138
And larger numbers:
23 x 36
X 20 3
30 600 90
6 120 8
600 + 120 = 720
90 + 18 = 108
720 + 108 = 828
142 x 25
X 100 40 2
20 2000 800 40
5 500 200 10
= 2000 + 1500 + 50
= 3550
Leading to compact reading: |
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