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1st Grade Math
13. 1.NBT.C.5
13.1 Adding numbers with 5s and 10s
Adding Numbers with 5s and 10s
Use 5 and 10 as friendly anchor numbers, learn the make a ten strategy, and add faster with ten frames and skip counting.
What You'll Learn
Recognize why 5 and 10 make convenient anchor numbers for quick mental addition
Apply the make a ten strategy by splitting an addend so part of it completes \( 10 \)
Use a ten frame to see ten partner facts such as \( 6 + 4 = 10 \) and \( 7 + 3 = 10 \)
Skip count by 5s and 10s to add quickly, such as \( 10 + 10 + 10 = 30 \)
Solve problems like \( 8 + 5 \) by making a ten first: \( 8 + 2 + 3 = 10 + 3 = 13 \)
What You'll Practice
1
Adding 5 to single-digit numbers up to 20
2
Adding 10 to numbers up to 20
3
Counting forward by 5s and 10s to find sums
Why This Matters
Adding with 5s and 10s builds your foundation for all future math. These friendly numbers help you add faster, understand place value, and prepare you for mental math strategies you'll use every day, from counting money to telling time.
This Unit Includes
4 Video lessons
Practice exercises
Learning resources
Skills
Addition
Counting
Number Sense
Place Value
Mental Math
OH Curriculum Aligned