How it works
The 12 math facts are the lines of the 12 times table, 12 × 1 = 12 to 12 × 12 = 144, and Go up to × 20 runs on to 12 × 20 = 240. Each is a count of dozens.
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Ten of it plus two of it
Since 12 is 10 + 2, every line is a 10s fact and a 2s fact added together. For 12 × 7, take 70 and 14: 70 + 14 = 84. Doubling works too, because 12 is 6 doubled: 6 × 9 = 54, so 12 × 9 = 108.
Quiz all 12 at once
With tables 1 to 11 known, 12 × 12 = 144 is the only new line. The rest have been met turned around, as 7 × 12 = 84. New quiz hides only 6 answers, so set Show the numbers to Blank under More options, type all 12 and press Check.
- 12 has 6 divisors, more than any smaller number, so a dozen shares evenly between 2, 3, 4 or 6.
- Feet and inches are 12 math facts at work: 4 feet is 12 × 4 = 48 inches.
Questions and answers
Which facts count as the 12 math facts?
They are the 12 lines of the 12 times table, with the answers 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132 and 144. Each line brings two division facts: for 12 × 7 = 84, 84 ÷ 12 = 7 and 84 ÷ 7 = 12.
How can a number be tested for the 12 times table?
It must pass two tests, because 12 is 3 × 4. Its digits add up to a multiple of 3, and its last two digits make a multiple of 4. For 324, 3 + 2 + 4 = 9 and 24 is 4 × 6, so 324 is 12 × 27.
What is past 12 × 12 on this chart?
Eight more lines, once Go up to is at × 20. The hours in a week are 12 × 14 = 168. The pence in a British pound before 1971 were 12 × 20 = 240: 12 pence to a shilling, 20 shillings to a pound.