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Grade 3 puzzle 6: Systematic listing

A free grade 3 math puzzle that teaches Systematic listing. Try it first — the hint and the full solution open when you are ready.

Problem 6 · Systematic listing · 4 points

Made by AI and not reviewed by a real person.

How many two-digit numbers have digits that add up to 5?

Illustration for problem 6
  1. 4
  2. 3
  3. 7
  4. 6
  5. 5
Show a hint
  • Let the first digit go 1, 2, 3, … and find the second digit each time.
Show the answer and solution

Answer: E — 5

March through first digits in order: 14, 23, 32, 41, 50 — five numbers. (05 is not a two-digit number.) A fixed marching order turns "did I find them all?" from a worry into a certainty.

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