Here are the solutions for each problem. For every equation, I first rounded both numbers to the nearest ten to get an estimate, and then calculated the exact answer.
1. 13 x 25
*
Estimate: Round 13 to
10 and 25 to
30.
* $10 \times 30 = 300$
*
Actual: $13 \times 25 = 325$
2. 16 x 33
*
Estimate: Round 16 to
20 and 33 to
30.
* $20 \times 30 = 600$
*
Actual: $16 \times 33 = 528$
3. 27 x 41
*
Estimate: Round 27 to
30 and 41 to
40.
* $30 \times 40 = 1,200$
*
Actual: $27 \times 41 = 1,107$
4. 48 x 12
*
Estimate: Round 48 to
50 and 12 to
10.
* $50 \times 10 = 500$
*
Actual: $48 \times 12 = 576$
5. 39 x 32
*
Estimate: Round 39 to
40 and 32 to
30.
* $40 \times 30 = 1,200$
*
Actual: $39 \times 32 = 1,248$
6. 66 x 23
*
Estimate: Round 66 to
70 and 23 to
20.
* $70 \times 20 = 1,400$
*
Actual: $66 \times 23 = 1,518$
7. 82 x 37
*
Estimate: Round 82 to
80 and 37 to
40.
* $80 \times 40 = 3,200$
*
Actual: $82 \times 37 = 3,034$
8. 14 x 95
*
Estimate: Round 14 to
10 and 95 to
100.
* $10 \times 100 = 1,000$
*
Actual: $14 \times 95 = 1,330$
9. 11 x 75
*
Estimate: Round 11 to
10 and 75 to
80.
* $10 \times 80 = 800$
*
Actual: $11 \times 75 = 825$
10. 21 x 53
*
Estimate: Round 21 to
20 and 53 to
50.
* $20 \times 50 = 1,000$
*
Actual: $21 \times 53 = 1,113$
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Final Answer:
1. Estimate: 300, Actual: 325
2. Estimate: 600, Actual: 528
3. Estimate: 1,200, Actual: 1,107
4. Estimate: 500, Actual: 576
5. Estimate: 1,200, Actual: 1,248
6. Estimate: 1,400, Actual: 1,518
7. Estimate: 3,200, Actual: 3,034
8. Estimate: 1,000, Actual: 1,330
9. Estimate: 800, Actual: 825
10. Estimate: 1,000, Actual: 1,113
Parent Tip: Review the logic above to help your child master the concept of estimation worksheet 5th grade.
