Estimating by rounding

“Before your child works out a calculation, can they make a sensible rough guess — and then check their answer using the opposite operation?”

0 / 6 mastered

• ⬜Round numbers to the nearest 10 or 100 to estimate a sum or difference before calculating
• ⬜Use addition to check a subtraction answer, or vice versa
• ⬜Identify when a calculated answer is unreasonable based on the estimate
• ⬜Round numbers to estimate a sum or difference before calculating
• ⬜Use addition to check a subtraction answer and vice versa
• ⬜Identify an unreasonable answer by comparing to the estimate