This document provides examples of estimating products by rounding numbers to the greatest place value. It shows rounding dollar amounts and whole numbers to the nearest hundred, ten, or ones place. The steps shown are to round each number, then multiply the rounded numbers using mental math. Examples include estimating $187 x 18 by rounding to $200 x 20 = $4,000, and 147 x 353 by rounding to 100 x 400 = 40,000.

1. 4-6 Estimating Products
Math Notes
Number Sense 1.1

2. Skills needed...
60 x 1 = 60
60 x 1 = 60
60 x 1 = 60
60 x 1 = 60

3. Skills needed...
60 x 1 = 60
60 x 10 = 60 0
60 x 100 = 6000
60 x 1000 = 600 00

4. Skills needed...

5. Skills needed...
700
X 60

6. Skills needed...
3 zeros
700
X 60

7. Skills needed...
3 zeros
700
X 60
000

8. Skills needed...
3 zeros
700
X 60
42,000

9. Skills needed...
3 zeros
700
X 60
42,000
80
X 70

10. Skills needed...
3 zeros
700
X 60
42,000 2 zeros
80
X 70

11. Skills needed...
3 zeros
700
X 60
42,000 2 zeros
80
X 70
00

12. Skills needed...
3 zeros
700
X 60
42,000 2 zeros
80
X 70
56 00

13. Estimate $187 x 18

14. Estimate $187 x 18
$187 x 18

15. Estimate $187 x 18
Round each number to the greatest place.
$187 x 18

16. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187
to the nearest hundred
$187 x 18

17. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187
to the nearest hundred
$187 x 18

18. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187
to the nearest hundred
$187 x 18

19. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187
to the nearest hundred
1
2
3
4 5
6
7
8
$187 x 18
0 9

20. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187
to the nearest hundred
1
2
3
4 5
6
7
8
$187 x 18
0 9

21. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187
to the nearest hundred
1
2
3
4 5
6
7
8
$187 x 18
0 9
$200

22. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18
0 9
$200

23. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18
0 9
$200

24. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18
0 9
$200

25. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18 1
0
2
3
4 5
6
7
8
0 9
9
$200

26. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18 1
0
2
3
4 5
6
7
8
0 9
9
$200

27. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18 1
0
2
3
4 5
6
7
8
0 9
9
$200 20

28. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18 1
0
2
3
4 5
6
7
8
0 9
9
$200 x 20
STEP THREE: Multiply using mental math

29. Estimate $187 x 18
Round each number to the greatest place.
STEP ONE: Round $187 STEP TWO: Round 18 to
to the nearest hundred the nearest ten
1
2
3
4 5
6
7
8
$187 x 18 1
0
2
3
4 5
6
7
8
0 9
9
$200 x 20 =$4000
STEP THREE: Multiply using mental math

30. Estimate 147 x 353

31. Estimate 147 x 353
147 x 353

32. Estimate 147 x 353
Round each number to the greatest place.
147 x 353

33. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to
the nearest hundred
147 x 353

34. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to
the nearest hundred
147 x 353

35. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to
the nearest hundred
147 x 353

36. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to
the nearest hundred
1
2
3
4 5
6
7
8
147 x 353
0 9

37. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to
the nearest hundred
1
2
3
4 5
6
7
8
147 x 353
0 9

38. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to
the nearest hundred
1
2
3
4 5
6
7
8
147 x 353
0 9
100

39. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353
0 9
100

40. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353
0 9
100

41. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353
0 9
100

42. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353 1
0
2
3
4 5
6
7
8
0 9
9
100

43. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353 1
0
2
3
4 5
6
7
8
0 9
9
100

44. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353 1
0
2
3
4 5
6
7
8
0 9
9
100 400

45. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353 1
0
2
3
4 5
6
7
8
0 9
9
100 x 400
STEP THREE: Multiply using mental math

46. Estimate 147 x 353
Round each number to the greatest place.
STEP ONE: Round 147 to STEP TWO: Round 353 to
the nearest hundred the nearest hundred
1
2
3
4 5
6
7
8
147 x 353 1
0
2
3
4 5
6
7
8
0 9
9
100 x 400 = 40000
STEP THREE: Multiply using mental math

47. Estimate $27.54 x 47

48. Estimate $27.54 x 47
$27.54 x 47

49. Estimate $27.54 x 47
Round each number to the greatest place.
$27.54 x 47

50. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54
to the nearest tens.
$27.54 x 47

51. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54
to the nearest tens.
$27.54 x 47

52. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54
to the nearest tens.
$27.54 x 47

53. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54
to the nearest tens.
1
2
3
4 5
6
7
$27.54 x 47
8
0 9

54. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54
to the nearest tens.
1
2
3
4 5
6
7
$27.54 x 47
8
0 9

55. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54
to the nearest tens.
1
2
3
4 5
6
7
$27.54 x 47
8
0 9
$30

56. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47
8
0 9
$30

57. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47
8
0 9
$30

58. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47
8
0 9
$30

59. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47 1
0
2
3
4 5
6
7
8
8 9
0 9
$30

60. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47 1
0
2
3
4 5
6
7
8
8 9
0 9
$30

61. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47 1
0
2
3
4 5
6
7
8
8 9
0 9
$30 50

62. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47 1
0
2
3
4 5
6
7
8
8 9
0 9
$30 x 50
STEP THREE: Multiply using mental math

63. Estimate $27.54 x 47
Round each number to the greatest place.
STEP ONE: Round $27.54 STEP TWO: Round 47 to
to the nearest tens. the nearest ten
1
2
3
4 5
6
7
$27.54 x 47 1
0
2
3
4 5
6
7
8
8 9
0 9
$30 x 50 =$1500
STEP THREE: Multiply using mental math