A three-part addition and subtraction worksheet within 1,000 for 3rd grade, targeting fluency under Common Core 3.NBT.2. Six regrouping computations open the page, from 348 + 275 to 900 - 542 with its double zero. The middle section pairs each answer with an inverse-operation check, and two school stories close it: a canned food drive collecting 438 and 385 cans, and a library losing 356 of its 720 chapter books to checkouts. The key includes the matching check equations.
3.NBT.2
“Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.”
All ten problems. Items like 804 − 367 and 900 − 542 demand regrouping across a zero, and Part 2 makes the addition-subtraction relationship the explicit checking tool.
Six problems in a grid, each with an answer box: 348 + 275, 712 − 438, 526 + 389, 804 − 367, 459 + 364, and 900 − 542. Every one requires at least one regroup.
Students solve 425 + 287, then subtract their answer from one addend to verify it. The mirror task solves 653 − 278 and checks by adding 278 back.
Oakridge Elementary's October and November can counts (438 and 385) get combined, and the library problem subtracts 356 checked-out books from 720.
Fluency block
Run Part 1 as the day's computation set. Question 6, 900 − 542, is the one to walk past desks for; borrowing across two zeros is where the algorithm cracks.
Teach self-checking
Make Part 2 the lesson itself. A student who finds 425 + 287 = 712 and then confirms 712 − 287 = 425 has learned something a red pen cannot teach.
Morning work
The can-drive and library stories in Part 3 stand alone as a two-problem warm-up on a day you need Part 1 for a different group.
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