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Estimating and Rounding Numbers
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Estimating and Rounding Numbers
Round 5 or more up to the next place value. Round 4 or less down. For estimation questions, show your rounded numbers and your estimate.
Rounding to the Nearest Ten
1.Round each number to the nearest ten: a) 62 b) 95 c) 147 d) 283.
2.Which number rounds to 70 when rounded to the nearest ten?
- 64
- 67
- 86
- 103
3.The number line shows 36 between 30 and 40. Is 36 closer to 30 or 40, and what is 36 rounded to the nearest ten?
4.True or false: 135 rounds to 130 when rounded to the nearest ten.
TrueFalse
Rounding to the Nearest Hundred
5.Round each number to the nearest hundred: a) 264 b) 751 c) 1,349 d) 2,650.
6.Select every number that rounds to 600 when rounded to the nearest hundred.
- 549
- 563
- 648
- 650
- 701
7.Match each number to its nearest hundred.
- 318
- 472
- 849
- 951
- 500
- 1,000
- 800
- 300
Estimation in Everyday Situations
8.At a wildlife sanctuary, Tahnee counts 47 wallabies near one feeding area and 36 near another. Round each count to the nearest ten, then estimate the total number of wallabies.
9.Cooper helps prepare food packs for a wildlife sanctuary. One delivery weighs 1,386 kg and another weighs 2,247 kg. Round each weight to the nearest thousand and estimate the combined weight.
10.Chloe-Mae records 286 visitors on Saturday and 419 on Sunday at a wildlife sanctuary. Estimate the weekend visitor total by rounding each day's count to the nearest hundred.
11.A wildlife sanctuary orders 8 boxes of bird seed. Each box costs $19. Estimate the total cost by rounding $19 to the nearest ten, then multiply by 8.
12.In one sentence, explain how rounding can help you check whether an exact calculation is reasonable.
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