This understanding includes accurate, efficient recall of subtraction facts with minuends up to 20 and nonnegative differences, including subtracting 0 and subtracting a number from itself. It connects subtraction to addition through inverse operations and part–whole relationships, enabling a fact such as to be interpreted as finding the missing part in ; larger-number computation and formal algorithms are not included.
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Detailed Explanation: Recall subtraction facts within 20
Subtraction can be thought of as finding a missing part. Use addition to help:
- Start with the number being subtracted: .
- Ask, “What number added to makes ?”
- Count up from to :
- The missing number is , so:
Check your answer with addition:
So, the subtraction fact is correct. Remember that subtracting leaves a number the same, and subtracting a number from itself gives .
Learn by doing: Recall subtraction facts within 20
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Subtraction - Whole Number - Within 20
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Download/Modify Free Grade 2 'Recall subtraction facts within 20' Worksheet
Print this free 'Recall subtraction facts within 20' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Subtraction - Whole Number - Within 20
- Subtraction - Missing Value, Within 20
- Subtraction - Whole Number - Within 20 - Columns
- Ten Groups - Subtract, Without Borrow, Less than 20
- Subtraction - Whole Number - Within 5
- Subtraction - Whole Number - Within 5 - Columns
- Picture Numbers - Subtracting - Picture and Instruction to Number (Within 20)
- Picture Numbers - Subtracting - Picture to Equation (Within 20)
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Recall subtraction facts within 20) through scaffolded problems that grow in difficulty as concepts are understood.