Add And Subtract Within 20 Introduction

True or False: The difference between 11 and 6 is 5.

Find the sum.

Solve.

Type in the missing number to make the subtraction sentence true.

Type in the subtraction sentence shown in this model.

Penny has 12 dolls. She gave her little sister 5 of them. How many dolls does Penny have now?

Which of these expressions are equal to 15? Select ALL that apply.

Four students were given a math problem. One of them made a mistake. Click on the student who made a mistake.

Melina says that the answer to 10 + 4 is bigger than the answer to 20 - 4. Do you agree with Melina? Explain.

Would you add or subtract to solve this problem? Explain why by typing in your answer.