Grade 4 - Progress in Mathematics

26. The Ecology Club brought 6 bundles of junk
    mail to the recycling center. Each bundle
    weighed 275 pounds. How many pounds
    of junk mail did the Ecology Club recycle?


27. Troop 42 collected 8 bins of cardboard for
    recycling. Four of the bins held 325 pounds
    of cardboard each. The other 4 bins held
    450 pounds of cardboard each. How many
    pounds of cardboard did Troop 42 collect?


28. Six of the families on Pine Road each recycled
    at least 8 aluminum cans each week last year. There
    are 52 weeks in a year. Altogether, did these families recycle
    more or less than 2000 aluminum cans last year? Explain.

Use front-end digits to estimate. Then multiply.

1. 504 2. 101 3. 210 4. 323 5. 223
   
   4
   3
   4
   2
   3


2. 308 7. 410 8. 271 9. 505 10. 192
   
   5
   8
   7
   9
   4


3. 634 12. 279 13. 844 14. 575 15. 397
   
   6
   9
   7
   8
   5

Find the product. Use mental math or paper and pencil.

16. 2
    304 17. 3
    131 18. 2
    642


17. 5
    160 20. 6
    702 21. 4
    261


18. 8
    625 23. 7
    444 24. 9
    368


19. Show how you could use the distributive
    property to find the product for exercise 16.

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