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Grades 1–5 · printable + timed

Subtracting 11 Timed Test

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

Operation
Fact range
Problems
Time limit

Subtraction · 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 · Subtraction · 11s · 20 problems NameDate
  1. 1 21 − 11 10
  2. 2 14 − 11 3
  3. 3 13 − 2 11
  4. 4 12 − 1 11
  5. 5 14 − 11 3
  6. 6 21 − 10 11
  7. 7 13 − 2 11
  8. 8 11 − 11 0
  9. 9 22 − 11 11
  10. 10 23 − 11 12
  11. 11 20 − 11 9
  12. 12 11 − 0 11
  13. 13 17 − 11 6
  14. 14 18 − 11 7
  15. 15 16 − 11 5
  16. 16 14 − 3 11
  17. 17 19 − 11 8
  18. 18 19 − 8 11
  19. 19 21 − 10 11
  20. 20 19 − 11 8
0 correct of 20

Correct 0 Wrong 0 Blank 20

0:00 elapsed of 1:00

Elapsed 0s Left 60s

A timed sheet on subtracting 11

Subtracting 11, from 11 − 11 to 23 − 11. 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

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

Where subtracting 11 goes wrong

Taking 11 away steps both digits down one — 18 − 11 = 7. The symmetry is visible, but a borrow appears once the ones digit is small: 13 − 11 = 2 stays inside the pattern while 21 − 11 = 10 changes shape, and that boundary is the only place a child stalls.

Three that come up

What happens when you subtract 11?
Both digits drop by one where possible: 19 − 11 = 8, 16 − 11 = 5.
Where does that pattern stop?
When the ones digit is smaller than 1 in the borrowing sense, or when the result crosses back into single digits from the twenties.
Is an 11s subtraction sheet useful?
Briefly, as place-value reinforcement. Only the borrowing cases need repeating.

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