Show:
Mental Math
Rounding Whole Numbers & Decimals
Estimating Sums & Differences
Adding & Subtracting Decimals
Problem Solving
100
Use mental math to solve: 3.8 + 1.5 =
5.3
100
Round to the nearest whole number: 643.82
644
100
Round to the nearest whole number to estimate: 87.2 + 3.9 =
92 (88 + 4 = 92)
100
Find the Difference: 7.8 - 4.9 =
2.9
100
Nate has a $5 bill and a $10 bill. He spends $2.50 for a smoothie and $2 for a muffin. How much money does he have left?
$10.50
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8.6 - 4.9 =
3.7
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Round to the thousandths place: 23.009
23.01
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Estimate to the whole number: 3.8 + 4.1 + 3.3 =
11 (4 + 4 + 3 = 11)
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Find the difference: 65.18 - 12.005 =
53.175
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Elias saved $30 in July, $21 in August, and $50 in September. He spent $18 on movies and $26 on gas. How much money does Elias have left?
$57
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Use mental math to solve: 66 + 1.8 + 2.2 =
70
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Round to the ten thousands place: 427,841
430,000
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Round to the nearest hundred to estimate: 179 + 277 =
500 (200 + 300= 500)
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Find the sum: 6.9 + 2.8 =
9.7
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Reilly adds 45.3 and 3.21. Should his sum be greater than or less than 48? Tell how you know without actually solving the problem.
Greater than 48 because the whole numbers add up to 48.
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Use mental math to solve: 3.99 + 3.11 + 6.3 =
13.4
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Round 95.25 to the nearest WHOLE #, TENTH, and TEN:
Whole #: 95 Tenth: 95.3 Ten: 100
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Estimate the difference to the nearest whole number: 12.97 - 3.95 =
9 (13 - 4 = 9)
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Find the difference: 34.49 - 12.619 =
21.871
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Fill in the blanks to complete the difference: 6. __ __ - __. 3 9 ___________ 1 . 8 6
6. 2 5 - 4. 3 9 ______ 1. 8 6
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Use mental math to solve: 2.1 + 0.9 + 1.2 =
4.2
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Round the number to the tenth place: 1.32
1.3
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Round to the nearest ten to estimate: 49 + 22 =
70 (50 + 20 = 70)
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Find the sum: 0.82 + 4.21 =
5.03
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Miami's annual precipitation n 2000 was 61.05 in. Albany's was 46.92 in. How much greater was Miami's precipitation than Albany"s?
14.13 in.