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Grade 1
Number
8. Demonstrate an understanding of addition of numbers with answers to 20 and their corresponding subtraction facts, concretely, pictorially and symbolically
8.1 Adding with digits up to 20
Adding with digits up to 20
What You'll Learn
Add two single-digit numbers with sums up to 20
Apply doubles facts to solve addition problems quickly
Use near doubles strategy by adding doubles plus one
Recognize number patterns to build mental math fluency
What You'll Practice
1
Adding doubles like 7+7, 8+8, and 9+9
2
Solving addition problems with sums between 10 and 20
3
Using doubles facts to find near doubles (e.g., 7+8)
Why This Matters
Mastering addition up to 20 builds the foundation for all future math. These strategies help you calculate quickly in your head, which you'll use every day for money, time, measurements, and solving more complex problems in higher grades.
This Unit Includes
Practice exercises
Skills
Addition
Doubles
Near Doubles
Mental Math
Number Sense
PEI Curriculum Aligned