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4.1 Independent Practice (WBK 253-254) #2-15

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  • 2) Estimate by rounding. Show how you estimated: 121/42
    120/40 = 3
  • 5) Estimate by rounding. Show how you estimated: 597/28
    600/30 = 20
  • 11) Estimate by rounding. Show how you estimated: 619/32
    600/30 = 20
  • 7) Estimate by rounding. Show how you estimated: 943/24
    1,000/25 = 40; 1,000/20 = 50
  • 13)  Estimate by rounding. Show how you estimated:  272/34
    290/30 = 9;  300/30 = 10
  • 8) Estimate by rounding. Show how you estimated: 653/52
    650/50 = 13; 700/50 = 14; 600/50 = 12
  • 9) Estimate by rounding. Show how you estimated: 208/51
    200/50 = 4
  • 3) Estimate by rounding. Show how you estimated: 400/23
    400/20 = 20
  • 6) Estimate by rounding. Show how you estimated: 244/38
    240/40 = 6
  • 12) Estimate by rounding. Show how you estimated: 847/43
    840/40 = 21; 800/40 = 20
  • 14) There are 598 goldfish divided equally among 23 fish tanks. About how many goldfish are in each tank?
    600/20 = 30; Each tank has about 30 goldfish.
  • 4) Estimate by rounding. Show how you estimated: 642/83
    640/80 = 8
  • 10) Estimate by rounding. Show how you estimated: 300/59
    300/60 = 5
  • 15) The area of a rectangle is 138 square meters, and the length is 21 meters. About how many meters long is the width?
    140/20 = 7; The width is about 7 meters.
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