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:
2 years ago
Definitely! Thank you for your detailed explanation!
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