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fact-minute

Grades 1–5 · printable + timed

Adding 11 Timed Test

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

Operation
Fact range
Problems
Time limit

Addition · 11s · 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 · 11s · 20 problems NameDate
  1. 1 11 + 4 15
  2. 2 5 + 11 16
  3. 3 2 + 11 13
  4. 4 11 + 11 22
  5. 5 10 + 11 21
  6. 6 11 + 2 13
  7. 7 11 + 6 17
  8. 8 11 + 7 18
  9. 9 1 + 11 12
  10. 10 11 + 3 14
  11. 11 3 + 11 14
  12. 12 12 + 11 23
  13. 13 7 + 11 18
  14. 14 11 + 7 18
  15. 15 2 + 11 13
  16. 16 9 + 11 20
  17. 17 4 + 11 15
  18. 18 5 + 11 16
  19. 19 11 + 11 22
  20. 20 6 + 11 17
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 11

Adding 11, from 11 + 0 to 11 + 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 11: all thirteen facts and their answers.
Problem Answer
11 + 0 11
11 + 1 12
11 + 2 13
11 + 3 14
11 + 4 15
11 + 5 16
11 + 6 17
11 + 7 18
11 + 8 19
11 + 9 20
11 + 10 21
11 + 11 22
11 + 12 23

Where adding 11 goes wrong

Adding 11 is adding 10 and then one more, so both digits step up together — 6 + 11 = 17. Children pick the symmetry up fast because it is visible. It breaks only where the ones digit is 9 and a carry appears (9 + 11 = 20), and that single boundary is where an otherwise clean sheet stops.

Three that come up

What happens when you add 11?
Both digits go up by one: 5 + 11 = 16, 7 + 11 = 18.
Where does that break?
When the ones digit is 9. 9 + 11 = 20, because the ones column carries.
Is adding 11 worth a separate sheet?
Briefly. It reinforces place value and takes only the carry cases to master.

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