Four operations on fractions · Set 1
Adding and subtracting mixed numbers, and multiplying fractions by whole numbers and by other fractions.
Name: ______________________ Date: ____________ Score: ______ / 6
- 1
1 and 2/3 + 2 and 1/4 = ?
1 markAnswer: ______________Here's howMake the denominators the same: 1 and 8/12 + 2 and 3/12Add the whole numbers and the fractions: 3 and 11/12Answer: 3 and 11/12 - 2
3 and 1/2 − 1 and 5/6 = ?
2 marksAnswer: ______________Here's howMake the denominators the same: 3 and 3/6 − 1 and 5/63/6 is smaller than 5/6, so rename: 2 and 9/6 − 1 and 5/6Subtract: 1 and 4/6 = 1 and 2/3Answer: 1 and 2/3 - 3
5/8 × 12 = ?
1 markAnswer: ______________Here's how5/8 × 12 = 60/8Simplify: 60/8 = 15/2 = 7 and 1/2Answer: 7 and 1/2 - 4
2/3 × 9/4 = ?
2 marksAnswer: ______________Here's howMultiply the numerators and the denominators: 18/12Simplify: 18/12 = 3/2 = 1 and 1/2Answer: 1 and 1/2 - 5
2 and 3/5 × 4 = ?
1 markAnswer: ______________Here's howChange to an improper fraction: 13/5 × 413/5 × 4 = 52/5 = 10 and 2/5Answer: 10 and 2/5 - 6
Mrs Lim baked some cookies. She gave 2/5 of them to her neighbours and 1/3 of the remainder to her sister. She had 84 cookies left. How many cookies did she bake?
3 marksAnswer: ______________Here's howRemainder after neighbours = 1 − 2/5 = 3/5Sister = 1/3 × 3/5 = 1/5Left = 3/5 − 1/5 = 2/5, so 2/5 → 84 and 1/5 → 42Total = 5 × 42 = 210Answer: 210 cookies
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