Grade 4 - Progress in Mathematics

Estimate each difference by rounding.

14. 54 15. $ .38 16. 932 17. $8.57 18. $42.34
    
    23
    .16
    629
    5.08
    15.75


15. 6152 20. 4819 21. 43,038 22. 241,701 23. $29.13
    
    2830
    592
    3,671
    45,089
    6.58

Use Estimation to Check

Use estimation to check addition or subtraction

to see if your answer is reasonable. Use rounding.

Estimated Estimated

Sum Difference

3516 3500 67,148 7 0,000

 430  400 
45,031 
 5 0,000

3946 3900 22,117 2 0,000

3946 is close to 3900. 22,117 is close to 20,000.

The answer is reasonable. The answer is reasonable.

Is the answer reasonable? Estimate to check. Use rounding.

Then write yesor no.

24. 34  15  49 25. 61  30  201 26. 56
    22  34


25. 43
    21  22 28. 121  405  426 29. $2.61 $3.28 $5.89


26. 3021 56,078 59,099 31. $49.95
    $36.20 $13.75


27. 75,379
    15,267 60,112 33. 31,714  215 33,129


28. 546,397
    42,064 504,333 35. 784,412 13,561 797,973


29. $21.46 $3.98 $32.54 $87.98

8204-6_080-081 10/20/05 9:27 AM Page 81