15 13/15 + 21 4/15 + 15 7/15

⚠ 15 13/15 is read as the mixed number 15 + 13/15■21 4/15 is read as the mixed number 21 + 4/15■15 7/15 is read as the mixed number 15 + 7/15

Let's evaluate:

15

+ \frac{13}{15}

+ 21

+ \frac{4}{15}

+ 15

+ \frac{7}{15}

ⓘ Start from

15

and move forward

21

on the number line:

15 + 21

36

■To add fractions, put them over the same denominator, then add the numerators:

\frac{13}{15} + \frac{4}{15}

\frac{13 + 4}{15}

36

+ \frac{13 + 4}{15}

+ 15

+ \frac{7}{15}

ⓘ The numerator and the denominator are computed before the division:

13 + 4

17

36

+ \frac{17}{15}

+ 15

+ \frac{7}{15}

ⓘ Start from

36

and move forward

15

on the number line:

36 + 15

51

■To add fractions, put them over the same denominator, then add the numerators:

\frac{17}{15} + \frac{7}{15}

\frac{17 + 7}{15}

51 + \frac{17 + 7}{15}

ⓘ The numerator and the denominator are computed before the division:

17 + 7

24

51 + \frac{24}{15}

ⓘ We simplify the fraction by dividing the numerator and the denominator by

3

, their greatest common divisor:

\frac{24}{15}

\frac{8 \times 3}{5 \times 3}

\frac{8}{5}

51 + \frac{8}{5}

▶Result:

52

\frac{3}{5}

ⓘ The fraction

\frac{8}{5}

is greater than 1: extract

1

from it and add it to the whole part:

51 + \frac{8}{5}

51 + \frac{5 + 3}{5}

51 + \frac{5}{5} + \frac{3}{5}

51 + 1 + \frac{3}{5}

52 + \frac{3}{5}

The numeric value of:

52 + \frac{3}{5}

equals:

52 + 0.6

▷

52.6

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