Grade 3 · Math · Lesson 10

Practice Mental Math Strategies

Mental math means calculating in your head without writing anything down. Using strategies makes this faster and easier. The three main strategies are: make-10, doubles (and near-doubles), and round-and-adjust.

What this lesson teaches

1Apply the make-10 strategy to add single-digit numbers mentally
2Use doubles and near-doubles to solve addition facts quickly
3Round-and-adjust to add or subtract near-multiples of 10 and 100 mentally

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