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primary 5 | Maths | Whole Numbers
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Chelson tan
Chelson Tan

primary 5 chevron_right Maths chevron_right Whole Numbers chevron_right Singapore

Please explain and tell me all the question

Date Posted: 4 years ago
Views: 523
Eric Nicholas K
Eric Nicholas K
4 years ago
The order of operations, in which we must perform, are

1. Brackets (settle everything within the brackets first before proceeding to the terms outside the brackets)

2. Multiplication/Division

3. Addition/Subtraction

So to illustrate for question 20,

810 - (200 / 8) + 56 x 13
= we do the terms inside brackets first
= 810 - 25 + 56 x 13
= we see the multiplication sign between 56 and 13 so we do this first
= 810 - 25 + 728
= now we are left with - and + so we do from left to right
= 785 + 728
= 1513

And for question 21,

545 - 76 + 5 - 486 / 3
= we do the division first which is in between 486 and 3
= 545 - 76 + 5 - 162
= now we are left with - and + so we do from left to right
= 469 + 5 - 162
= 474 - 162
= 312

You can try the rest on your own.

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Hui Jia
Hui Jia's answer
1 answers (Tutor Details)
1st
I cant see question 20 and 24.

Basically you need to
1) solve the numbers in the brackets first
2) solve the divide and multiply from left to right
3) solve the plus and minus from left to right

I hope this helps
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Zhi Yang
Zhi Yang's answer
1 answers (A Helpful Person)
This are the solution for question 20 and 24. Remember always solve the from the bracket first followed by divide or times, then plus and minus. Hope my solution helps you understand :)