### Lim Yi Xin's answer to Sushi's Primary 5 Maths Whole Numbers Singapore question.

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Using BODMAS, the order of mathematical operation is as follows:

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 :)

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 :)

Date Posted:
1 week ago

Definitely! Thank you for your detailed explanation!