1. Problem of the Day: B) 400 C) 300 D) 100
1.8 Estimate Differences
Problem of the Day:
There were 418 tickets collected at the Lane Theater before noon. In the afternoon, there were 289 tickets collected. About how many tickets were collected in all?
A) 700
B) 400
C) 300
D) 100

2. 1.8 Estimate Differences
Use compatible numbers (numbers that are easy to compute mentally and are close to the real numbers).
So, the group weighed about ____ pounds more than the yellow fish tuna.
What other compatible numbers could you have used?

3. Try This! Estimate. Use compatible numbers.
1.8 Estimate Differences
Try This! Estimate. Use compatible numbers.
Estimate: = ____
73 75
- 22 ___
376

4. Another Way: Use place value to round.
1.8 Estimate Differences
Another Way: Use place value to round.
436 – 387 =
Step 1: Round 436 to the nearest ten.
436
- 387

5. Another Way: Use place value to round.
1.8 Estimate Differences
Another Way: Use place value to round.
436 – 387 =
Step 2: Round 387 to the nearest ten.
_______

6. Another Way: Use place value to round.
1.8 Estimate Differences
Another Way: Use place value to round.
436 – 387 =
Step 3: Find the difference of the rounded numbers.
So, 436 – 387 is about _____.

7. Try This! Estimate. Use place value to round.
1.8 Estimate Differences
Try This! Estimate. Use place value to round.
___
642

8. 1.8 Estimate Differences
Use compatible numbers to complete the problem. Then estimate the difference.
___
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9. 1.8 Estimate Differences
2) Use rounding or compatible numbers to estimate the difference. 57
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10. 1.8 Estimate Differences
3) Use rounding or compatible numbers to estimate the difference.
642
___
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11. 1.8 Estimate Differences
4) Use rounding or compatible numbers to estimate the difference.
374
___
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