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Basic Arithmetic: Addition and Subtraction

Core concepts of adding to and taking away from quantities, progressing from single digits to multi-digit numbers with regrouping.

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SUBCATEGORY
ADDITION AND SUBTRACTION WORD PROBLEMS
Applying addition and subtraction skills to solve one-step and two-step real-world scenarios.
0 LEARNERS
6 STACKS
SUBCATEGORY
DOUBLE-DIGIT ADDITION WITHOUT REGROUPING
Adding two-digit numbers where the sum of the ones place does not exceed nine.
0 LEARNERS
5 STACKS
SUBCATEGORY
DOUBLE-DIGIT ADDITION WITH REGROUPING
Adding two-digit numbers requiring carrying over a ten to the tens place.
0 LEARNERS
5 STACKS
SUBCATEGORY
DOUBLE-DIGIT SUBTRACTION WITHOUT REGROUPING
Subtracting two-digit numbers where the top digit in the ones place is larger than the bottom digit.
0 LEARNERS
4 STACKS
SUBCATEGORY
DOUBLE-DIGIT SUBTRACTION WITH REGROUPING
Subtracting two-digit numbers requiring borrowing from the tens place.
0 LEARNERS
5 STACKS
SUBCATEGORY
ESTIMATING SUMS AND DIFFERENCES
Using rounding techniques to find approximate answers to addition and subtraction problems.
0 LEARNERS
5 STACKS
SUBCATEGORY
MULTI-DIGIT ADDITION
Adding numbers with three or more digits, reinforcing place value and regrouping strategies.
0 LEARNERS
7 STACKS
SUBCATEGORY
MULTI-DIGIT SUBTRACTION
Subtracting numbers with three or more digits, including subtracting across zeros.
0 LEARNERS
5 STACKS
SUBCATEGORY
SINGLE-DIGIT ADDITION
Combining two single-digit numbers to find a total sum, emphasizing basic fact fluency.
0 LEARNERS
9 STACKS
SUBCATEGORY
SINGLE-DIGIT SUBTRACTION
Taking one single-digit number away from another to find the difference.
0 LEARNERS
8 STACKS
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