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## Question

primary 5 | Maths
| Whole Numbers

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Notice that for multiplication, 7 and 4 can be done together (since box, 7 and 4 are multiplied together)

Also notice that 56 = 2 x 28

57 x 28 = box x 28 - 2 x 28 - 3 x 28

Let me replace “28” by “apples”

57 apples = box apples - 2 apples - 3 apples

Does it look better now?

57 = box - 2 - 3

What is the value of box?

62.

### See 2 Answers

3 x 28 = 84

84 +1596 = 1680

1680 +56 = 1736

1736 / 4 = 434

434 / 7 = 62

Brackets->Orders->Division->Multiplication-> Addition‐>Subtraction

In this question, we only focus on Division-> Multiplication-> Addition‐>Subtraction

Hence, subtraction/addition one side does not affect the multiplication/division on the same side and we can solve the question like so:

57×28=⬜×7×4-56-3x28

1596=⬜×7×4-56-84

1596=⬜×7×4-140

To bring the -140 over to the left side,

Add +140 on both sides

1596+56+84=⬜×7×4-140+140

1736=⬜×7×4

⬜=1736÷7÷4

⬜=62

Hope this helps you to understand better :)