Grade 5 Multi-Digit Multiplication with the Standard Algorithm

Forty-nine times twenty-nine. Sixty-three times eighteen. Two-digit by two-digit is the size at which the standard algorithm stops being optional and starts being the only sane method, and it is exactly what fifth grade asks for. A second station on the same standard runs smaller products into a combination lock, so a cadet can warm up before the belt. The numbers are drawn fresh every run — there is no version of this to memorize.

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What this station asks for

☄️ Through the Asteroid BeltA belt of asteroids blocks the path. Work out each two-digit multiplication, then blast the asteroid showing that exact product. Quick thinking, Agent! You solve each problem and tap the drifting space rock that carries the answer. Five tasks, then a boot print goes into the Case File.
🔐 Crack the Reactor VaultFinal lock! The reactor vault uses a three-dial combination. Solve each multiplication and set the dials to the exact product to crack it. Seal the case, Commander! You spin the combination wheels to the answer to crack the lock. Five tasks, then a hidden map goes into the Case File.

Five questions it might ask

Drawn from the same pool the activity uses, so these are the real thing rather than an illustration. The numbers change on every attempt — there is no fixed set to memorize.

Question	Answer
67 × 13 = ?	871
44 × 12 = ?	528
16 × 15 = ?	240
66 × 29 = ?	1914
20 × 13 = ?	260

👀 What to watch for

The recurring fifth grade error is forgetting the placeholder zero on the second partial product, which lands the answer roughly a tenth of where it should be. If 49 × 29 comes back near 700 instead of near 1,400, that's the one.

The Common Core standard behind it

Official wording, quoted in full — not our summary of it:

5.NBT.B.5	Fluently multiply multi-digit whole numbers using the standard algorithm.

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Other Grade 5 skills in this case

Order of operations5.OA.A.1 Long division5.NBT.B.6

Multi-digit multiplication at other grades

All grades

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