Math tricks Practice

What you’ll practice

Try a shortcut only after you can explain why it works. Optional problem information supplies guidance; it is fine to use an ordinary calculation instead.

Where this helps

Finding simpler ways to calculate with math you already know.

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.

Related practice

• Mental Math Practice
• Complements to 10
• Mental complements
• Mental addition within 100
• Mental subtraction within 100