- A
- B
- C
- D
Step-by-Step Solution
Write 1 as , then . Adding instead of subtracting gives , and reaching for the reciprocal gives — but flipping is for division, not for completing a whole.
Answer: D)
What must be added to to make a whole 1?
Class 7Fractions and DecimalsFractions and Decimals
Key idea: Dividing decimals
Two cases:
**By a whole number**: divide as if the decimal weren't there, then place the decimal in the answer above its position in the dividend. 4.8 ÷ 6 = 0.8 (because 48 ÷ 6 = 8, and the decimal sits above).
**By a decimal**: shift the decimal point in BOTH numbers the same number of places to make the divisor a whole number. Then divide as in case 1. 4.8 ÷ 0.6 → shift one place → 48 ÷ 6 = 8.
**By a whole number**: divide as if the decimal weren't there, then place the decimal in the answer above its position in the dividend. 4.8 ÷ 6 = 0.8 (because 48 ÷ 6 = 8, and the decimal sits above).
**By a decimal**: shift the decimal point in BOTH numbers the same number of places to make the divisor a whole number. Then divide as in case 1. 4.8 ÷ 0.6 → shift one place → 48 ÷ 6 = 8.
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