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X Multiplication Methods X
I can use a number line, like this:
2x5 means 5 jumps of 2
Or 2 jumps of 5
Therefore 2x5=10
I can use the grid method to partition bigger numbers, like 5x35
|x |30 |5 |
|5 |150 |25 |
5x35 = 150 + 25=175
( Division Methods (
(
To divide 12 by 3, I can think of an array of 12 in groups of 3 like this:
|( |( |( |( |
|( |( |( |( |
|( |( |( |( |
I have 4 groups of 3, so 12(3=4
I can count on along a number line to work out 20(4=, like this:
I need 5 jumps of +4 to reach 20.
Therefore 20(4=5
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I know my 2x table, so I can do 7x2=14 in my head.
I know from my tables that 5x8=40, so I can work out 40(5=8 in my head.
0 5 10
+4
+5
+4
+5
+4
+2
+2
+2
+2
+2
0 2 4 6 8 10
+4
+4
0 4 8 12 16 20
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