45*2 = 90 so 45*20 = 900
45*3 = 135
So 45*23 = 45*20 + 45*3 = 900 + 135 = 1035
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1x3=3x3=9
How can you use 2x10 to find 4x10
1 x 7 plus 2 x 7 is the same as 3 x 7
The fact that 3 x 9 = 27
In what situtation can you use only multiplication to find equivalent fraction? Give an example