Grade 4 - Progress in Mathematics

Use front-end digits to make a rough estimate. Then adjust.

1. 212 2. 358 3. 588 4. $ 3.47 5. $ 6.98
   672 143 419 1.30 4.25
   
   827
   796
   622
   9.65
   6.10


2. 3235 7. 9139 8. 5405 9. $ 67.99 10. $ 78.65
   5871 2584 1679 73.46 18.98
   
   1886
   4475
   2961
   36.49
   21.49


3. 635
   198
   474
   360 12. $ 5.32
   $ 7.12
   $ 3.69
   $ 1.95


4. 283
   722
   542
   156 14. $ 6.58
   $ 1.40
   $ 2.56
   $ 4.61

Use the table on page 96.

15. Students in Hilldale West School read 4073 books. About how
    many books did the students in all Hilldale schools read?

Estimate Differences

To estimate differences using front-end estimation:


Subtract the front digits.


Write 0s for the other digits.

$ 7 3.45 5736 $ 8 .21 963

 2 6.50  1775  7 .35  315

about $ 50. 00 about 4000 about $ 1. 00 about 600

Estimate the difference. Use front-end estimation.

16. 646 17. 441 18. 938 19. $ 8.98 20. $ 2.56
     519  193  256  3.50  1.48


17. 7149 22. 5460 23. 8432 24. $ 49.90 25. $ 37.21
     3861  1509  5954  24.95  18.88

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