Estimation of Products and Quotients

1
Estimation of Products and Quotients

• Fractions, Mixed Numbers, Decimals

2
Estimate each product by rounding the factors.

• 2.9 x 12.2
• .89 x 3.2
• .5 x 9.9
• .25 x 12.3
• 3.9 x 25.12
• .5 x 99
• .25 x 99
• .6 x 19

3
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2
• .5 x 9.9
• .25 x 12.3
• 3.9 x 25.12
• .5 x 99
• .25 x 99
• .6 x 19

4
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2 think 1 x 3 3
• .5 x 9.9
• .25 x 12.3
• 3.9 x 25.12
• .5 x 99
• .25 x 99
• .6 x 19

5
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2 think 1 x 3 3
• .5 x 9.9 think ½ of 10 5
• .25 x 12.3
• 3.9 x 25.12
• .5 x 99
• .25 x 99
• .6 x 19

6
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2 think 1 x 3 3
• .5 x 9.9 think ½ of 10 5
• .25 x 12.3 think ¼ of 12 3
• 3.9 x 25.12
• .5 x 99
• .25 x 99
• .6 x 19

7
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2 think 1 x 3 3
• .5 x 9.9 think ½ of 10 5
• .25 x 12.3 think ¼ of 12 3
• 3.9 x 25.12 think 4 x 25 100
• .5 x 99
• .25 x 99
• .6 x 19

8
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2 think 1 x 3 3
• .5 x 9.9 think ½ of 10 5
• .25 x 12.3 think ¼ of 12 3
• 3.9 x 25.12 think 4 x 25 100
• .5 x 99 think ½ of 100 50
• .25 x 99
• .6 x 19

9
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2 think 1 x 3 3
• .5 x 9.9 think ½ of 10 5
• .25 x 12.3 think ¼ of 12 3
• 3.9 x 25.12 think 4 x 25 100
• .5 x 99 think ½ of 100 50
• .25 x 99 think ¼ of 100 25
• .6 x 19

10
Estimate each product by rounding the factors.

• 2.9 x 12.2 think 3 x 12 36
• .89 x 3.2 think 1 x 3 3
• .5 x 9.9 think ½ of 10 5
• .25 x 12.3 think ¼ of 12 3
• 3.9 x 25.12 think 4 x 25 100
• .5 x 99 think ½ of 100 50
• .25 x 99 think ¼ of 100 25
• .6 x 19 think ½ of 20 10

11
Estimate each product by rounding the factors.

• 1/3 x 8
• ¼ x 15
• 1/5 x 24
• 1/10 x 38
• 1/6 x 35
• 2/3 x 26
• ¾ x 39
• 3/5 x 44

12
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15
• 1/5 x 24
• 1/10 x 38
• 1/6 x 35
• 2/3 x 26
• ¾ x 39
• 3/5 x 44

13
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15 think ¼ of 16 4
• 1/5 x 24
• 1/10 x 38
• 1/6 x 35
• 2/3 x 26
• ¾ x 39
• 3/5 x 44

14
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15 think ¼ of 16 4
• 1/5 x 24 think 1/5 of 25 5
• 1/10 x 38
• 1/6 x 35
• 2/3 x 26
• ¾ x 39
• 3/5 x 44

15
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15 think ¼ of 16 4
• 1/5 x 24 think 1/5 of 25 5
• 1/10 x 38 think 1/10 of 40 4
• 1/6 x 35
• 2/3 x 26
• ¾ x 39
• 3/5 x 44

16
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15 think ¼ of 16 4
• 1/5 x 24 think 1/5 of 25 5
• 1/10 x 38 think 1/10 of 40 4
• 1/6 x 35 think 1/6 of 36 6
• 2/3 x 26
• ¾ x 39
• 3/5 x 44

17
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15 think ¼ of 16 4
• 1/5 x 24 think 1/5 of 25 5
• 1/10 x 38 think 1/10 of 40 4
• 1/6 x 35 think 1/6 of 36 6
• 2/3 x 26 think 2/3 of 27 18
• ¾ x 39
• 3/5 x 44

18
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15 think ¼ of 16 4
• 1/5 x 24 think 1/5 of 25 5
• 1/10 x 38 think 1/10 of 40 4
• 1/6 x 35 think 1/6 of 36 6
• 2/3 x 26 think 2/3 of 27 18
• ¾ x 39 think ¾ of 40 30
• 3/5 x 44

19
Estimate each product by rounding the factors.

• 1/3 x 8 think 1/3 of 9 3
• ¼ x 15 think ¼ of 16 4
• 1/5 x 24 think 1/5 of 25 5
• 1/10 x 38 think 1/10 of 40 4
• 1/6 x 35 think 1/6 of 36 6
• 2/3 x 26 think 2/3 of 27 18
• ¾ x 39 think ¾ of 40 30
• 3/5 x 44 think 3/5 of 45 27

20
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1
• 22.3 6.9
• 63 8.85
• 16 3 ¾
• 54 8 8/9
• 6) 29 ½ 3
• 7) 90.3 2.8
• 8) 15.8 16.2

21
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9
• 63 8.85
• 16 3 ¾
• 54 8 8/9
• 6) 29 ½ 3
• 7) 90.3 2.8
• 8) 15.8 16.2

22
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9 think 21 7 3
• 63 8.85
• 4) 16 3 ¾
• 54 8 8/9
• 6) 29 ½ 3
• 90.3 2.8
• 8) 15.8 16.2

23
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9 think 21 7 3
• 63 8.85 think 63 9 7
• 4) 16 3 ¾
• 5) 54 8 8/9
• 29 ½ 3
• 7) 90.3 2.8
• 8) 15.8 16.2

24
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9 think 21 7 3
• 63 8.85 think 63 9 7
• 4) 16 3 ¾ think 16 4 4
• 5) 54 8 8/9
• 29 ½ 3
• 90.3 2.8
• 8) 15.8 16.2

25
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9 think 21 7 3
• 63 8.85 think 63 9 7
• 4) 16 3 ¾ think 16 4 4
• 5) 54 8 8/9 think 54 9 6
• 6) 29 ½ 3
• 90.3 2.8
• 8) 15.8 16.2

26
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9 think 21 7 3
• 63 8.85 think 63 9 7
• 4) 16 3 ¾ think 16 4 4
• 5) 54 8 8/9 think 54 9 6
• 6) 29 ½ 3 think 30 3 10
• 7) 90.3 2.8
• 8) 15.8 16.2

27
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9 think 21 7 3
• 63 8.85 think 63 9 7
• 4) 16 3 ¾ think 16 4 4
• 5) 54 8 8/9 think 54 9 6
• 6) 29 ½ 3 think 30 3 10
• 7) 90.3 2.8 think 90 3 30
• 8) 15.8 16.2

28
Estimate each quotient by rounding the dividend
and divisor.

• 8.9 3.1 think 9 3 3
• 22.3 6.9 think 21 7 3
• 63 8.85 think 63 9 7
• 4) 16 3 ¾ think 16 4 4
• 5) 54 8 8/9 think 54 9 6
• 6) 29 ½ 3 think 30 3 10
• 7) 90.3 2.8 think 90 3 30
• 8) 15.8 16.2 think 16 16 1