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fact-minute

Grades 1–5 · printable + timed

Adding 10 Timed Test

Print it with the answer key on page 2, or run the timer here.

Operation
Fact range
Problems
Time limit

Addition · 10s · 20 problems · 1 minute NameDateScore
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20
Answer key · Addition · 10s · 20 problems NameDate
  1. 1 10 + 10 20
  2. 2 10 + 8 18
  3. 3 10 + 4 14
  4. 4 10 + 5 15
  5. 5 10 + 2 12
  6. 6 3 + 10 13
  7. 7 10 + 7 17
  8. 8 10 + 3 13
  9. 9 0 + 10 10
  10. 10 10 + 2 12
  11. 11 10 + 10 20
  12. 12 10 + 5 15
  13. 13 10 + 1 11
  14. 14 10 + 9 19
  15. 15 10 + 10 20
  16. 16 10 + 10 20
  17. 17 10 + 1 11
  18. 18 7 + 10 17
  19. 19 6 + 10 16
  20. 20 0 + 10 10
0 correct of 20

Correct 0 Wrong 0 Blank 20

0:00 elapsed of 1:00

Elapsed 0s Left 60s

A timed sheet on adding 10

Adding 10, from 10 + 0 to 10 + 12. Every problem on the sheet is drawn from that set and nothing outside it.

Choose 20, 50 or 100 problems and a limit of 1, 2 or 5 minutes, then print the sheet with its answer key on page two, or start the timer and type into the same grid. The problems are drawn again every time the page loads, so a second sheet is not a copy of the first. How the counts and limits work is on its own page, along with what a timed test does and does not measure.

Thirteen rows, with the answers

Adding 10: all thirteen facts and their answers.
Problem Answer
10 + 0 10
10 + 1 11
10 + 2 12
10 + 3 13
10 + 4 14
10 + 5 15
10 + 6 16
10 + 7 17
10 + 8 18
10 + 9 19
10 + 10 20
10 + 11 21
10 + 12 22

Where adding 10 goes wrong

Adding 10 raises the tens digit and leaves the ones digit untouched. This range measures place value rather than addition, and a changed ones digit means place value has not settled yet. The one trap is linguistic: the names of the teen numbers — thirteen, fourteen, fifteen — hide the structure they are built from.

Three that come up

Why does adding 10 leave the ones digit alone?
Because the ten lands entirely in the tens column. 7 + 10 = 17, with the 7 untouched.
What does a wrong ones digit mean here?
Place value is not yet secure. It is worth going back before moving to two-digit addition.
Why do teen number names confuse children?
Thirteen says the three before the ten, which hides the structure that 10 + 3 makes plain.

What the standards and the critics actually say

Common Core State Standards for Mathematics (PDF), page 19 — 2.OA.B.2 “By end of Grade 2, know from memory all sums of two one-digit numbers.” thecorestandards.org — CCSSI_Math Standards.pdf

NCTM — Procedural Fluency in Mathematics (position statement) “Timed tests do not assess fluency and can negatively affect students, and thus should be avoided.” nctm.org — Procedural Fluency in Mathematics

youcubed — Fluency Without Fear “For about one third of students the onset of timed testing is the beginning of math anxiety.” youcubed.org — Fluency Without Fear