Checking Answers by Rounding

“If your child gets an answer of 4,213 for an addition, can they round the numbers to double-check — like '4,000 + 1,000 ≈ 5,000' — and spot if the answer seems way off?”

0 / 3 mastered

• ⬜Check 47,832 + 23,156 ≈ 48,000 + 23,000 = 71,000 to verify the exact answer 70,988
• ⬜Decide whether to round to the nearest 100 or 1,000 for a given estimation context
• ⬜Identify that a calculated answer of 3,421 cannot be correct because the estimate gives approximately 50,000