1. a) 1$\frac{1}{3}$ + 2$\frac{1}{2}$
= $\frac{4}{3}$ + $\frac{5}{2}$
= $\frac{8}{6}$ + $\frac{15}{6}$
= $\frac{23}{6}$
b) 3$\frac{2}{5}$ - 1$\frac{1}{10}$
= $\frac{17}{5}$ - $\frac{11}{10}$
= $\frac{34}{10}$ - $\frac{11}{10}$
= $\frac{23}{10}$
c) 3$\frac{1}{2}$ × 1$\frac{1}{7}$
= $\frac{7}{2}$ × $\frac{8}{7}$
= $\frac{56}{14}$ = 4
d) 4$\frac{1}{6}$ ÷ 2$\frac{1}{3}$
= $\frac{25}{6}$ ÷ $\frac{7}{3}$
= $\frac{25}{6}$ × $\frac{3}{7}$
= $\frac{75}{42}$ = $\frac{25}{14}$
2. 8 m 5 dm = 85 dm
9 m 7 dm = 97 dm
11 cm 3 mm = 113 mm
1 m 83 cm = 183 cm
6 m 6 cm = 606 cm
