1. 4 1/2-2 2/4+6 2/5=

1. 4 1/2 – 2 2/4 + 6 2/5 = 9/2 – 10/4 + 32/5 = ( 90 – 50 + 128 )/20 = 268/20 = 13 8/20 = 13 4/10 = 13 2/5

2. 15 2/4 + 2 4/8 – 13 4/5 = 62/4 + 20/8 – 69/5 = ( 620 + 100 – 276 )/40 = 444/40 = 11 4/40 = 11 1/10

3. 4/3 × 5/8 ÷ 5/3 = 4/3 × 5/8 × 3/5 = 60/120 = 1/2

4. 11 2/3 ÷ 3/2 = 35/3 × 2/3 = 70/9 = 7 7/9

5. 4 2/5 – 2,5 = 22/5 – 25/10 = ( 44 – 25 )/10 = 19/10 = 1 9/10

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