Build procedural fluency with adding and subtracting numbers up to 10,000. Master regrouping, estimation, and checking your work!
Add multi-digit numbers, regrouping when sums exceed 9
Subtract with regrouping, including across zeros
Use rounding to estimate and check answers
Solve accurately and efficiently using any standard algorithm
Any efficient and accurate procedure for adding/subtracting. Students should explain WHY it works using place value.
Trading 10 ones for 1 ten, or 10 tens for 1 hundred. Key phrase: "10 of this = 1 of that."
When there's a zero, regroup from the next place. Example: 500 becomes 4 hundreds + 10 tens.
Estimate first, then compute. If your answer is way off from the estimate, check your work!
Complete lesson plans and strategies
Introduction to addition and subtraction concepts
25 problems across all skill types
10 test-format questions
Home practice activities
Complete solutions with explanations
Print all materials for classroom use or send home with students.