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fact-minute

Grades 1–5 · printable + timed

Dividing by 12 Timed Test

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

Operation
Fact range
Problems
Time limit

Division · 12s · 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 · Division · 12s · 20 problems NameDate
  1. 1 60 ÷ 12 5
  2. 2 0 ÷ 12 0
  3. 3 108 ÷ 9 12
  4. 4 12 ÷ 1 12
  5. 5 84 ÷ 7 12
  6. 6 12 ÷ 1 12
  7. 7 36 ÷ 3 12
  8. 8 108 ÷ 9 12
  9. 9 36 ÷ 3 12
  10. 10 96 ÷ 12 8
  11. 11 12 ÷ 1 12
  12. 12 144 ÷ 12 12
  13. 13 144 ÷ 12 12
  14. 14 72 ÷ 12 6
  15. 15 120 ÷ 10 12
  16. 16 84 ÷ 12 7
  17. 17 144 ÷ 12 12
  18. 18 60 ÷ 5 12
  19. 19 12 ÷ 1 12
  20. 20 12 ÷ 1 12
0 correct of 20

Correct 0 Wrong 0 Blank 20

0:00 elapsed of 1:00

Elapsed 0s Left 60s

A timed sheet on dividing by 12

Dividing by 12, from 0 ÷ 12 to 144 ÷ 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

Dividing by 12: all thirteen facts and their answers.
Problem Answer
0 ÷ 12 0
12 ÷ 12 1
24 ÷ 12 2
36 ÷ 12 3
48 ÷ 12 4
60 ÷ 12 5
72 ÷ 12 6
84 ÷ 12 7
96 ÷ 12 8
108 ÷ 12 9
120 ÷ 12 10
132 ÷ 12 11
144 ÷ 12 12

Where dividing by 12 goes wrong

Dividing by 12 becomes automatic later than anything else in the division set: no rule identifies a multiple of 12 by sight, and the dividends grow into three digits at 108, 120 and 132. Dividing by 4 and then by 3 is the safest two-step route, and it also makes the arithmetic checkable at the halfway point.

Three that come up

How do you divide by 12 mentally?
Divide by 4, then by 3. 96 ÷ 4 = 24, 24 ÷ 3 = 8.
Why is dividing by 12 harder than dividing by 10?
There is no place-value shortcut and the dividends run into three digits.
Where do 12s mistakes cluster?
On 108, 120, and 132, where the child has to carry a hundreds digit through the split.

What the standards and the critics actually say

Common Core State Standards for Mathematics (PDF), page 23 — 3.OA.C.7 “By the end of Grade 3, know from memory all products 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