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Multiplication
In and Out
Estimation
Decimals
Random
100
5 * 58 =
290
100
6 --> 24 8 --> 32 10 --> ____ Rule:
40 Rule: * 4
100
Estimate to the nearest hundred: 486 + 783 =
500 + 800 = 1,300
100
0.45 + 0.9 =
1.35
100
Measure your expo marker to the nearest inch.
See Teacher
200
241 * 4 =
964
200
3 --> ___ 9 --> 63 ___ --> 77 Rule: ?
21, 11 Rule: *7
200
Estimate to the nearest ten: 349 + 311 =
350 + 310 = 660
200
2.63 + 4.27 =
6.9
200
Measure length of white board to the nearest half centimeter.
See teacher
300
55 * 89 =
4,895
300
70 --> ___ ___ --> 4,000 90 --> 4,500
3,500, Rule: * 50
300
Estimate to the nearest hundred: 7, 809 + 4, 831 =
7, 800 + 4, 800 = 13,600
300
8.9 - 5.4 =
3.5
300
Students at an elementary school drink 500 cartons of milk a day at lunch. How many cartons of milk to they drink in a week? Month?
week: 2,500 month: 15,000
400
49 * 99 =
4,581
400
4 --> 280 __ --> 420 8 --> ___
6, 560 Rule: * 70
400
Estimate to the nearest ten: 987 + 874 + 748 =
990 + 870 + 750 = 2,610
400
12.89 - 7.54 =
5.35
400
A kitten sleeps 15 hours a day. How many hours a week? A month? A year?
Week: 105 Month: 450 Year: 5,475
500
782 * 34 =
26,588
500
30 --> 1,800 40 --> _____ ___ --> 30,000
24,000 50 Rule: * 600
500
Estimate to the nearest hundred: 932 + 748 + 753 =
900 + 700 + 800 = 2,400
500
0.55 - 0.4 = 0.51 IS THIS CORRECT? WHY OR WHY NOT?
No, you need to line up the decimals. The correct answer should be 0.15.
500
Will your answer be in the tens, hundreds, thousands, or more? Estimate to find out. 74 * 54 =
70 * 50 = 3,500 Thousands