Mathematics Mathematical Thinking Meta 7–8 yrs

Justifying mathematical reasoning

论证数学推理

Description

Construct and follow multi-step mathematical arguments; identify errors in reasoning and explain why a method works or does not work

Mastery Evidence

✓ Explain step by step why a columnar addition method gives the correct answer
✓ Find and explain an error in a worked example (e.g. incorrect regrouping)
✓ Construct a simple argument for why a general statement is true (e.g. 'adding two even numbers always gives an even number')

Assessment Prompt

If your child hears another child's explanation for how they solved a maths problem, can your child say whether the reasoning makes sense — and if not, point out exactly where the logic goes wrong?