Grade 4 - Progress in Mathematics

Find the product.

11. 23 12. 42 13. 61 14. 70 15. 60
    
    20
    60
    30
    40
    50


12. 230 17. 420 18. 610 19. 700 20. 600
    
    20
    60
    30
    40
    50


13. 52 22. 25 23. 19 24. 80 25. 40
    
    80
    90
    70
    80
    90


14. 520 27. 250 28. 190 29. 800 30. 400
    
    80
    90
    70
    80
    90

Look for a pattern to find each product.

31. 1
    78 32. 9
    60 33. 2
    78
    10
    78 90
    60 20
    78
    10
    780 90
    600 20
    780


32. 7
    60 35. 8
    50 36. 6
    35
    70
    60 80
    50 60
    35
    70
    600 80
    500 60
    350

Compute mentally. Explain how you found your answer.

37. How many zeros are in the 38. How many zeros are in the
    product when you product when you
    multiply 10
    670? multiply 40
    500?

Find the products mentally.

39. 1
    56 40. 7
    41 41. 3
    63
    10
    56 70
    41 30
    63
    100
    56 700
    41 300
    63
    100
    560 700
    410 300
    630
    100
    5600 700
    4100 300
    6300

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