This Grade 5 worksheet moves into estimating products and quotients of multi-digit numbers using rounding and compatible numbers. Students estimate perimeter and area for rectangles by rounding side lengths first. Matching pairs reinforce how 50 times 300 or 600 divided by 30 makes mental math fast. Grade 5 learners build number sense by choosing factors and divisors that compute cleanly without long calculation.
Style:
Estimation Strategies
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Estimate 47 times 312 by rounding to 50 and 300 to get 15000.
2. Estimate 612 divided by 31 using compatible numbers 600 and 30 to get 20.
3. Estimate 89 times 41 by rounding to 90 and 40 to get 3600.
4. A rectangle is 38 cm by 22 cm. Estimate the perimeter using 40 and 20 to get 120 cm.
5. Estimate 7,812 divided by 38 with compatible numbers 8000 and 40 to get 200.
6. Estimate the area of a 19 by 41 rectangle using 20 and 40 to get 800 square units.
7. Estimate 58 times 23 by rounding both factors to get 1200.
8. Estimate 4,210 divided by 68 using compatible numbers 4200 and 70 to get 60.
9. Estimate the perimeter of a 49 cm by 31 cm rectangle using 50 and 30 to get 160 cm.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
48 times 21
→ About 1000
About 1000
789 divided by 41
→ About 20
About 20
29 cm by 11 cm area
→ About 300
About 300
6,210 divided by 31
→ About 200
About 200
Estimation Strategies
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) Estimate 47 times 312 by rounding to 50 and 300 to get 15000.
2) Estimate 612 divided by 31 using compatible numbers 600 and 30 to get 20.
3) Estimate 89 times 41 by rounding to 90 and 40 to get 3600.
4) A rectangle is 38 cm by 22 cm. Estimate the perimeter using 40 and 20 to get 120 cm.
5) Estimate 7,812 divided by 38 with compatible numbers 8000 and 40 to get 200.
6) Estimate the area of a 19 by 41 rectangle using 20 and 40 to get 800 square units.
7) Estimate 58 times 23 by rounding both factors to get 1200.
8) Estimate 4,210 divided by 68 using compatible numbers 4200 and 70 to get 60.
9) Estimate the perimeter of a 49 cm by 31 cm rectangle using 50 and 30 to get 160 cm.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
48 times 21
→ About 1000
About 1000
789 divided by 41
→ About 20
About 20
29 cm by 11 cm area
→ About 300
About 300
6,210 divided by 31
→ About 200
About 200
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
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