Overview

Grade 1 Math

B2. Operations

8. B2.1 Properties and Relationships

8.4 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

Adding 5 to single-digit numbers up to 20

Adding 10 to numbers up to 20

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

ON Curriculum Aligned