Mathematics
Multiplication & Division
Procedural
8–9 yrs
Multiplying by Tens
乘以整十数
Description
Multiply one-digit whole numbers by multiples of 10 in the range 10–90 using strategies based on place value and properties of operations
Mastery Evidence
- Calculate 7 × 30 = 210 by reasoning 7 × 3 tens = 21 tens = 210
- Explain why multiplying by a multiple of 10 adds a zero to the product
- Use this skill to estimate products of larger numbers
Assessment Prompt
Can your child quickly work out '7 × 40' or '6 × 80' by first doing the single-digit multiplication and then placing the zero — getting 280 and 480?
Prerequisites 2
The three digits of a three-digit number
位值理解支持关于十位数的推理
Fluent multiplication and division facts
乘以10的倍数需要单位数的流利运算能力
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