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Grade 3 Math · World 5: Ten Times Tower · Level 45
Multiply by Multiples of 10
6 × 20 = 6 × 2 × 10 = 120.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 45
- What is 6 times 20? 20 is 2 tens. So 6 times 20 is 6 groups of 2 tens: 12 tens!
- 12 tens is 120. You can also group it: 6 × 2 × 10. First 6 × 2 is 12, then 12 × 10 is 120.
- Try 4 × 70: 4 × 7 is 28, so 4 × 70 is 28 tens, which is 280.
Georgia's K-12 Mathematics Standards:
- 3.PAR.3.5 — Use place value reasoning and properties of operations to multiply one-digit whole numbers by multiples of 10, in the range 10-90.
- 3.PAR.3.3 — Apply properties of operations (i.e., commutative property, associative property, distributive property) to multiply and divide within 100.