Mental complements Practice

What you’ll practice

Find the gap to a nearby friendly total. This is useful for changing a difficult calculation into a simpler one plus a small correction.

Where this helps

Fast addition, subtraction, estimation, and making change.

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

• Mental Math Practice
• Addition within 10
• Subtraction within 10
• Complements to 10
• Tens and ones