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Odd and even practice online: pairing, last digit and quick checks

For: Ages 6-9. Updated 2026-10-15.

Odd and even is one of the fastest number properties to check, and one of the most useful for spotting mistakes. This page is a practice track: short checks you can do online with the generator and tool, then print.

Warm-up: the pairing test

For a small number, make pairs of blocks. One left over means odd; none left over means even. Do this for 8, 11 and 14 before using any digit rule.

Speed rule: look at the ones digit

Once pairing is clear, switch to the last digit. Ends in 0, 2, 4, 6 or 8 → even. Ends in 1, 3, 5, 7 or 9 → odd. Try it on numbers the child did not just build, so they cannot rely on memory of the pairs.

Online practice loop

  1. Open the Number Blocks Generator and Set a number.
  2. Guess odd or even before opening Number facts.
  3. Confirm in the facts panel, then press Break it down for the written explanation.
  4. Print the practice card when you want a paper record.

Start with 258 (even) and then try 259 (odd) side by side. Open the tool with 258

Odd or even mixed set

Say odd or even, then how you know. Check answers after the whole set.

  1. 74
  2. 1,005
  3. 90
  4. 33 + 18
  5. 25 + 25
  6. 40 − 7
Show answers
  1. Even (ends in 4).
  2. Odd (ends in 5).
  3. Even (ends in 0).
  4. Odd: 51. Odd + even = odd.
  5. Even: 50. Odd + odd = even.
  6. Odd: 33.

Keep learning

Prime numbers for kids: rectangles, tests and a first hundred chartA kid-friendly path into primes: build rectangles with blocks, learn why 1 is not prime, spot common traps, and practice with the Number Blocks Tool.Skip counting practice: 2s, 5s, 10s and linking to multiplesSkip-counting drills tied to place value and the Number Blocks Generator, with forward and backward patterns and answers.Hundreds, tens and ones practice with expanded formFocused practice on three-digit place value: reading digits by place, expanded form, and comparing numbers that look similar.