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fact-minute

Grades 1–5 · printable + timed

Adding 8 Timed Test

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

Operation
Fact range
Problems
Time limit

Addition · 8s · 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 · 8s · 20 problems NameDate
  1. 1 1 + 8 9
  2. 2 8 + 11 19
  3. 3 8 + 2 10
  4. 4 6 + 8 14
  5. 5 1 + 8 9
  6. 6 8 + 2 10
  7. 7 1 + 8 9
  8. 8 1 + 8 9
  9. 9 9 + 8 17
  10. 10 8 + 8 16
  11. 11 1 + 8 9
  12. 12 8 + 11 19
  13. 13 8 + 12 20
  14. 14 9 + 8 17
  15. 15 8 + 12 20
  16. 16 8 + 7 15
  17. 17 5 + 8 13
  18. 18 7 + 8 15
  19. 19 12 + 8 20
  20. 20 8 + 12 20
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 8

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

Where adding 8 goes wrong

The quickest way to add 8 is to add 10 and take 2 back — 8 + 6 = 16 − 2 = 14. Because the amount taken back is 2, the signature error in this range is an answer two too large, in the same way the 3s produce answers one too large. Consistently two high means the second step is being skipped.

Three that come up

What is the fastest way to add 8?
Add 10 and subtract 2. 8 + 7 becomes 17 − 2 = 15.
My child is two too high on every 8s problem. Why?
They added 10 and stopped. The size of the error is the size of the skipped step.
Is make-ten better than add-ten-take-two?
Both work. Add-ten is faster once the child is comfortable subtracting a small amount.

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