how can you use 4×7 to find 8×7
If you think about it, 4x7 is half of 8x7 (If you multiply 4, 7, and 2, you get 8x7). So really you can just multiply 4x7 by 2 and you will get 8x7!
So if u look 4x7 is half of 8 x7 so times 4 and 7 then just double it