Problem: Estimating Division Worksheet
The task is to estimate the quotients of the given division problems using mental math. Let's solve each problem step by step.
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Section 1:
1.
108 ÷ 9
- Estimate: Round 108 to 108 (it's already close to a multiple of 9).
- \( 108 \div 9 = 12 \)
-
Answer: 12
2.
365 ÷ 5
- Estimate: Round 365 to 360 (a closer multiple of 5).
- \( 360 \div 5 = 72 \)
-
Answer: 72
3.
120 ÷ 2
- Estimate: 120 is already a simple number.
- \( 120 \div 2 = 60 \)
-
Answer: 60
4.
630 ÷ 7
- Estimate: 630 is a multiple of 7.
- \( 630 \div 7 = 90 \)
-
Answer: 90
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Section 2:
5.
2550 ÷ 5
- Estimate: 2550 is close to 2500.
- \( 2500 \div 5 = 500 \)
-
Answer: 500
6.
3638 ÷ 2
- Estimate: 3638 is close to 3640.
- \( 3640 \div 2 = 1820 \)
-
Answer: 1820
7.
1600 ÷ 8
- Estimate: 1600 is a simple number.
- \( 1600 \div 8 = 200 \)
-
Answer: 200
8.
99 ÷ 11
- Estimate: 99 is a multiple of 11.
- \( 99 \div 11 = 9 \)
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Answer: 9
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Section 3:
9.
3600 ÷ 90
- Estimate: Simplify by dividing both numbers by 10.
- \( 360 \div 9 = 40 \)
-
Answer: 40
10.
209 ÷ 19
- Estimate: Round 209 to 200.
- \( 200 \div 20 = 10 \) (close approximation).
-
Answer: 10
11.
20 ÷ 4
- Estimate: Simple division.
- \( 20 \div 4 = 5 \)
-
Answer: 5
12.
1800 ÷ 15
- Estimate: Break it down:
- \( 1800 \div 15 = (1800 \div 3) \div 5 = 600 \div 5 = 120 \)
-
Answer: 120
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Section 4:
13.
72 ÷ 9
- Estimate: Simple division.
- \( 72 \div 9 = 8 \)
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Answer: 8
14.
240 ÷ 20
- Estimate: Simplify by dividing both numbers by 10.
- \( 24 \div 2 = 12 \)
-
Answer: 12
15.
1300 ÷ 12
- Estimate: Round 1300 to 1200.
- \( 1200 \div 12 = 100 \)
-
Answer: 100
16.
19200 ÷ 16
- Estimate: Simplify by dividing both numbers by 16.
- \( 19200 \div 16 = 1200 \)
-
Answer: 1200
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Final Answers:
\[
\boxed{
\begin{array}{ll}
108 \div 9 = 12 & 120 \div 2 = 60 \\
365 \div 5 = 72 & 630 \div 7 = 90 \\
2550 \div 5 = 500 & 1600 \div 8 = 200 \\
3638 \div 2 = 1820 & 99 \div 11 = 9 \\
3600 \div 90 = 40 & 20 \div 4 = 5 \\
209 \div 19 = 10 & 1800 \div 15 = 120 \\
72 \div 9 = 8 & 1300 \div 12 = 100 \\
240 \div 20 = 12 & 19200 \div 16 = 1200 \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of estimate division worksheet.
