Mathematics Multiplication & Division Procedural 10–11 yrs

Ratio (age 10+)

比与比例（10岁以上）

Description

Perform mental calculations including with mixed operations and large numbers, using strategies such as partitioning, compensation, and derived facts

Mastery Evidence

✓ Mentally compute 45 × 8 by partitioning into 40 × 8 + 5 × 8
✓ Use known facts to derive 6.5 × 4 mentally
✓ Solve a multi-operation mental calculation such as 250 × 3 + 500 and explain the strategy used

Assessment Prompt

Can your child work out a mixed calculation like '(200 × 6) + 350 − 75' entirely in their head — keeping track of each step without writing anything down?