andyromero
09.12.2021 •
Mathematics
7 2/15 + 5 2/3 +9 13/15
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Ответ:
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
Ответ: