Grade 1 Subtraction Within 20 - Easy
A easy grade 1 worksheet for Subtraction.
Worksheet snapshot
- Subtraction (within 20)
- Key concepts: Understanding core subtraction (within 10) concepts for Grade 1; Applying subtraction (within 10) strategies appropriate to Grade 1
- Students begin with foundational subtraction (within 10) concepts at Grade 1 level, using concrete models and visual supports to build understanding.
- Apply it: Subtraction (within 10) at the Grade 1 level connects to everyday situations students encounter: problem-solving in daily life, making sense of quantities and relationships, and building mathematical literacy for future learning.
- 17 - 2 =
- 19 - 5 =
- 19 - 5 =
About Subtraction (within 10)
Subtraction is the operation of finding the difference between quantities or removing a part from a whole. Students learn to see subtraction as both 'taking away' and 'finding the difference,' developing flexibility in their mathematical thinking.
Subtraction is fundamental to mathematics and everyday life. It's used for comparing quantities, calculating change, measuring differences, and solving problems involving 'how many more' or 'how many left.' Strong subtraction skills support learning negative numbers, algebraic thinking, and proportional reasoning.
Subtraction (within 20)
Subtract within 20 using count-back/count-on, take-from-10, and fact families; explain unknown addends.
This easy level worksheet:
Subtract within 12 using count-back on a number line; match related facts (10 - 3 = 7 because 7 + 3 = 10).
Key Concepts
- Count back or count on to find differences
- Use make-10/take-from-10 to subtract
- Use fact families to find unknown parts
Prerequisite skills
Add/subtract within 10; fluent count-on; understand part-part-whole.
Teaching Strategies
Model on ten-frames and number lines; highlight related facts; draw bar models for unknown addends.
Assessment ideas
Test fact fluency with timed checks. Include subtraction word problems requiring interpretation. Ask students to explain their strategy. Have students check subtraction using addition. Present problems requiring regrouping and evaluate understanding.
Common Challenges
Counting past 10 and losing track; reversing minuend/subtrahend; forgetting to link to related addition facts.
Real-World Applications
Change from small amounts, how many more/less between two totals, and leftover items.
Extension Activities
Write full fact families for given sums; solve two-step problems that mix add and subtract.
Parent Tips
Ask your child to show both a count-back and count-on method and to check answers with addition.