7 2/15 + 5 2/3 +9 13/15

1 Add the whole numbers first.

21+\frac{2}{15}+\frac{2}{3}+\frac{13}{15}

21+

15

2

+

3

2

+

15

13

2 Find the Least Common Denominator (LCD) of \frac{2}{15},\frac{2}{3},\frac{13}{15}

15

2

,

3

2

,

15

13

. In other words, find the Least Common Multiple (LCM) of 15,3,1515,3,15.

LCD = 1515

3 Make the denominators the same as the LCD.

21+\frac{2}{15}+\frac{2\times 5}{3\times 5}+\frac{13}{15}

21+

15

2

+

3×5

2×5

+

15

13

4 Simplify. Denominators are now the same.

21+\frac{2}{15}+\frac{10}{15}+\frac{13}{15}

21+

15

2

+

15

10

+

15

13

5 Join the denominators.

21+\frac{2+10+13}{15}

21+

15

2+10+13

6 Simplify.

21+\frac{25}{15}

21+

15

25

7 Convert \frac{25}{15}

15

25

to mixed fraction.

21+1\frac{10}{15}

21+1

15

10

8 Simplify.

22\frac{10}{15}

22

15

10

9 Simplify \frac{10}{15}

15

10

to \frac{2}{3}

3

2

.

22\frac{2}{3}

22

3

2

Done

Decimal Form: 22.666667

the answer of this question is last one

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