Answer:

17. D

18. B

19. C

20. A

Step-by-step explanation:

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Answer:

17. D. 1/12

18. B. 4

19. C. 8

20. A. 187.28

Step-by-step explanation:

17. D. 1/12

• Since the denominator are different, we must rewrite the fraction so that they both have the same denominator.
• We must use LCD (least common denominator) and use it as the denominator of both fraction.
• 3= 3, 6, 9, 12.
• 4= 4, 8, 12.
• We perceive that the least common denominator of both numbers are 12, and so we'll rewrite 12 as the denominator of both fractions.
• Write equivalent fractions to both fractions.

1×4/12 1×3/12

= 4/12-3/12

• Subtract the fractions.
• 4-3=1 (when we subtract fractions, we only subtract the numerator if the denominator are same.)

=1/12

18. B. 4

• Keep the whole number and add it from the fraction after adding the fraction from the whole number from other fraction.

1/2+1/2= 1

• So 1+3=4

19. C. 8

• Add the whole number from other whole number and add the fraction of the whole number from other fraction of whole number.

7+7+7+7+7+7+7+7=7×8=56

1/2+1/2+1/2+1/2+1/2+1/2+1/2+1/2=1/2×8=4

• So 56+4=60.

20. A. 187.28

• Multiply all numbers from 23.41 to 8.

1×8=8

4×8=32 carry 3

3×8=24+3=27 carry 2

2×8=16+2=18

• So 187.28 is the answer.