91Ó°ÊÓ

Find each sum or difference. Write in simplest form. $$9 \frac{2}{3}+\frac{1}{6}$$

Find sum or difference. Write in simplest form. \(7 \frac{4}{7}-2 \frac{5}{7}\)

One driver can circle a one-mile track in 30 seconds. Another driver takes 20 seconds. If they both start at the same time, in how many seconds will they be together again at the starting line?

Write each decimal as a fraction or mixed number in simplest form. $$5, \overline{6}$$

Find each product. Use an area model if necessary. $$-\frac{5}{12} \cdot 3 \frac{1}{9}$$

Find the least common multiple (LCM) of each pair of numbers or monomials. $$\frac{4}{5}, \frac{1}{2}$$

Find each product. Use an area model if necessary. $$2 \frac{1}{3} \cdot 6 \frac{2}{7}$$

Express each number in scientific notation. The flow rate of some Antarctic glaciers is 0.00031 mile per hour.

Find each product. Use an area model if necessary. $$3 \frac{1}{3} \cdot 2 \frac{5}{8}$$

Express each number in scientific notation. A human blinks about 6.25 million times a year.