Missing numbers within 20 Practice

What you’ll practice

Use subtraction to find a missing addend and addition to check a missing subtraction part. The blank need not appear on the right.

Where this helps

Recognizing each direction of a number relationship.

Before you start

Use this topic to practice math you have already learned. The examples show the available kinds of recall tasks; this is not a complete textbook chapter. Check the answer form and any stated conditions.

Grades and courses that include this topic

Related practice

• Addition within 10
• Subtraction within 10
• Complements to 10
• Tens and ones