Fluent adding and subtracting within 100
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction
Typical age: 7–8 years
“Can your child reliably add or subtract two-digit numbers like '68 + 27' or '91 − 45', choosing the best strategy for each problem?”
0 / 3 mastered
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- Numbers on a number line
Number line representations support addition/subtraction within 100
- Halves and quarters (age 7+)REQUIRED
Money word problems require fluent addition/subtraction within 100
- Addition and subtraction word problems
Word problems within 100 require fluent addition/subtraction within 100
- Addition and subtraction within 1000REQUIRED
Adding/subtracting within 1000 extends within-100 skills
- Mental addition and subtraction (age 7+)
Fluent within-100 skills support mental three-digit + ones
- Adding and subtracting (age 7+)REQUIRED
Columnar methods require fluent within-100 addition/subtraction
- Adding numbersREQUIRED
Requires fluent addition within 100 to combine multiple two-digit numbers
- Two-Step Word ProblemsREQUIRED
Solving word problems within 100 requires fluent computation within 100
- Addition and subtraction strategies (age 7+)REQUIRED
Must be able to use strategies before explaining why they work