OK Mastering the OSTP in Grade 3 math Chapter 2

259 + 170 =

928 – 364 =

Read each problem and answer the question.

There are two fact families in the sentences below. Separate and re-write the numbers below into the two fact families.

$$\begin{gathered} 15 + 19 = 34 18 + 16 = 34 34 – 15 = 19 34 – 19 = 15 \\ 34 – 16 = 18 16 + 18 = 34 19 + 15 = 34 34 – 18 = 16 \end{gathered}$$

Rita counted 23 apples in the basket. She and her family ate 7 of the apples. How can Rita find out how many apples are left in the basket. Select the correct answer.

Solve the problems below. Then write a number sentence that could be used to check your answer.

Part A Solve

58 – 14 =

Part B.

Write a number sentence that could be used to check your answer.