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3rd Grade Math
10. 3.NBT.A.3
10.2 Addition using Estimation
Addition using Estimation
What You'll Learn
Apply rounding strategies to estimate sums of numbers up to 1000
Round numbers to the nearest ten or hundred before adding
Determine when estimation is appropriate for quick mental calculations
Compare estimated sums to exact answers to check reasonableness
What You'll Practice
1
Rounding two-digit and three-digit numbers before adding
2
Estimating sums of numbers up to 1000
3
Using mental math to calculate approximate totals
Why This Matters
Estimation helps you quickly check if answers make sense, make fast decisions when shopping or budgeting, and solve problems when exact calculations aren't needed. This mental math skill builds number sense you'll use daily throughout your life.
This Unit Includes
4 Video lessons
Practice exercises
Skills
Estimation
Rounding
Addition
Mental Math
Number Sense
Place Value
TN Curriculum Aligned