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