Let’s solve each problem one by one, step by step.
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Problem 1:
Original weight = 800 kg
First reduction = 91 kg → 800 - 91 = 709 kg
Second reduction = 84 kg → 709 - 84 = 625 kg
Third reduction = 49 kg → 625 - 49 = 576 kg
✔ Final weight =
576 kg
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Problem 2:
Starting weight = 141 kg
Lost in month 1: 19 kg → 141 - 19 = 122 kg
Month 2: 9 kg → 122 - 9 = 113 kg
Month 3: 13 kg → 113 - 13 = 100 kg
Month 4: 21 kg → 100 - 21 = 79 kg
Month 5: 15 kg → 79 - 15 = 64 kg
✔ Final weight =
64 kg
*(Alternative way: Add all lost weight first: 19 + 9 + 13 + 21 + 15 = 77 kg. Then 141 - 77 = 64 kg — same answer!)*
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Problem 3:
Old hours = 185 per month
She works 112 hours less now → 185 - 112 = 73 hours
✔ New hours =
73 hours per month
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Problem 4:
April earnings = $992
May earnings = $365
How much less? → 992 - 365 = ?
Let’s subtract:
992
-365
——
Start from right:
2 - 5 → can’t do, borrow → 12 - 5 = 7
8 (since we borrowed) - 6 = 2
9 - 3 = 6
So, 992 - 365 =
627
✔ He earned
$627 less in May.
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Final Answer:
1. 576 kg
2. 64 kg
3. 73 hours
4. $627
Parent Tip: Review the logic above to help your child master the concept of 3rd grade math word problems worksheet.
