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3rd Grade Math
11. 3.NBT.A.2
11.4 Addition Tables Up to 1000
Addition Tables Up to 1000
Discover how an addition table or addition chart works for larger numbers, and use place value patterns to add quickly up to 1000.
What You'll Learn
Read a basic addition table by matching a row number and a column number to find their sum.
Recognize that addition tables for larger numbers repeat the same pattern shifted by tens or hundreds.
Apply place value to split a number like 356 into 300, 50, and 6 before adding.
Use the fact \( 4 + 5 = 9 \) to quickly solve \( 400 + 500 = 900 \) or \( 40 + 50 = 90 \).
Check sums up to 1000 by estimating first and comparing the estimate to the table result.
Build a personal addition reference chart to practice facts before working with three-digit numbers.
What You'll Practice
1
Completing addition tables by adding the same number repeatedly
2
Finding missing values in skip counting sequences up to 1000
3
Filling rows and columns in structured addition charts
Why This Matters
Addition tables strengthen your mental math skills and help you see number patterns that make calculations faster. These strategies are essential for multiplication, division, and solving real-world problems involving repeated amounts like counting money or measuring ingredients.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Addition
Skip Counting
Number Patterns
Mental Math
Tables
OH Curriculum Aligned