Grade 4 · Math · Lesson 7

Practice Mental Math Strategies

Mental math strategies let you solve number problems quickly in your head without writing every step. Knowing which strategy to use — and why — makes you a more flexible and confident mathematician.

What this lesson teaches

1Apply the make-a-ten strategy to add mentally
2Use the break-apart (decomposition) strategy to multiply mentally
3Apply doubles and near-doubles to speed up mental addition
4Choose the most efficient mental math strategy for a given problem

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