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1st Grade Math
12. 1.NBT.C.4
12.3 Adding with doubles up to 100
Adding with Doubles up to 100
Master doubles addition facts and the near doubles strategy to add numbers up to 100 quickly, without counting one by one.
What You'll Learn
Recognize a doubles fact as any sum where both addends are the same, such as \( 6 + 6 = 12 \).
Memorize doubles from \( 1+1 \) through \( 10+10 \) as instant recall facts.
Extend doubles to larger numbers by doubling tens and ones separately, such as \( 23 + 23 = 46 \).
Apply the near doubles strategy by rewriting a sum as a double plus or minus one, like \( 6+7 = 6+6+1 \).
Use near doubles on two-digit sums up to one hundred, such as \( 24 + 25 = 24 + 24 + 1 = 49 \).
Check answers by comparing the near double result to the nearest known doubles fact.
What You'll Practice
1
Adding doubles like 25 + 25, 38 + 38, and 47 + 47
2
Rewriting near doubles as doubles plus or minus one
3
Solving addition problems using the doubles strategy
Why This Matters
Mastering doubles and near doubles gives you a powerful mental math shortcut that makes addition faster and easier. This strategy builds number sense and helps you solve problems quickly without always relying on paper or calculators, a skill you'll use daily.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Doubles
Addition
Mental Math
Number Sense
Fact Fluency
OH Curriculum Aligned