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Recap: Mental Math

Part of the Numbers & Operations section of Coddy's Pre-Algebra journey. Lesson 9 of 57.

Challenge

Work out 4 × 19 × 25 - 38 - 62 the fast way.

Try it yourself

4 * 19 * 25 - 38 - 62

Simplify the expression

All lessons in Numbers & Operations

2Mental Math

Friendly Pairs Take Away the TotalRecap: Mental Math

5Subtracting Integers

Add the Opposite Subtracting a Negative Plus and Minus in a Row Distance Between Numbers Recap: Subtracting Integers

8Square Roots

Perfect Squares Undoing a Square Roots in Expressions The Root Sign Groups Between Two Whole Numbers Recap: Square Roots

11Final Challenges

Final: Every Rule at Once Final: Roots and Powers Final: The Freezer Final: Over the Bar Final: On the Line

3Negative Numbers

Below Zero Opposites Greater or Less Absolute Value Recap: The Number Line

6Multiplying and Dividing

Negative Times Positive Two Negatives Counting the Negatives Dividing Integers Zero in Division Recap: Multiply and Divide

9Putting It All Together

Powers Before Products Negatives Inside Negative Bases in Sums Everything at Once Recap: The Full Order