Grade 4 · Computational Fluency
Addition and Subtraction to 10,000
Addition and subtraction to 10,000 extend the strategies from Grade 3 to four-digit numbers. Decompose 6,847 + 2,365 into thousands, hundreds, tens, and ones, add each independently, then recombine: 8,000 + 1,100 + 11 + 12 = 9,212 (with regrouping). The same place-value logic applies; the numbers are simply larger. Estimation becomes more critical as numbers grow larger, because errors are harder to spot without a predicted target.
LESSON VIDEO
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Lesson video
A short walkthrough to play in class or assign for flipped/at-home viewing.
WHAT STUDENTS WILL LEARN
✓Apply flexible computation strategies for four-digit addition and subtraction: decomposing, friendly numbers, compensating, regrouping
✓Estimate sums and differences to 10,000 using benchmarks
✓Solve multi-step addition and subtraction problems in real-life and problem-based contexts
✓Use number talks to explore strategies for large-number computation
✓Check answers using inverse operations and estimation