Addition within 20 means adding two numbers where the total is 20 or less. It builds on basic addition skills and helps children develop mental math strategies, such as counting on, using number lines, or recognizing patterns to find the sum quickly.

Key strategies for addition within 20:

• Counting on: Start with the larger number and count up by the smaller number.
• Making 10: Break numbers into parts to first make 10, then add the rest.
• Using number bonds: Recognize pairs of numbers that add up to a target number.

Examples:

Example 1:
Problem: 7 + 5
Solution: Start at 7 and count up 5 more: 8, 9, 10, 11, 12.
Answer: 12.

Example 2:
Problem: 9 + 6
Solution: Break 6 into 1 and 5 to make 10 first: (9 + 1 = 10), then add the remaining 5: (10 + 5 = 15).
Answer: 15.

By practicing addition within 20, children strengthen their ability to work with numbers quickly and confidently, setting the stage for larger numbers and more complex math operations.

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