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3rd Grade Math
1. 3.OA.A.1
1.5 Multiplying using Mental Strategies
Multiplying Using Mental Strategies
Discover simple multiplication strategies that let you multiply numbers quickly in your head, without writing anything down.
What You'll Learn
Break a factor into friendlier parts and multiply each part separately, such as \( 7 \times 8 = 7 \times 5 + 7 \times 3 \)
Add the two partial products together to find the final answer, like \( 35 + 21 = 56 \)
Use doubling to multiply by 2, then double again to multiply by 4
Apply known facts about multiplying by 5 and 10 to solve harder problems faster
Recognize that multiplying by 1 keeps a number the same and multiplying by 0 always gives 0
Check an answer by multiplying the same numbers in a different order or with a different strategy
What You'll Practice
1
Breaking multi-digit numbers into place value components for easier multiplication
2
Using the split strategy to multiply numbers up to 999
3
Filling in step-by-step blanks to show mental math calculations
Why This Matters
Mental multiplication strategies help you solve problems faster without relying on calculators or paper. These skills strengthen your number sense, making everyday tasks like estimating costs, calculating tips, and solving multi-step problems much easier throughout school and life.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Mental Math
Multiplication
Decomposition
Distributive Property
Number Sense
Place Value
OH Curriculum Aligned