How it works
Twelve lines, 1 × 1 = 1 to 1 × 12 = 12, make up the 1 times table; choose × 20 under Go up to and it runs on to 1 × 20 = 20. In the one times table every answer is the other number.
Read the full guide
One rule in place of twenty facts
Multiplying by 1 leaves a number as it is. One group of 7 is 7, and seven groups of 1 are 7 again, so 1 × 7 = 7 and 7 × 1 = 7 are one fact read two ways. Each line also holds two division facts: 7 ÷ 1 = 7 and 7 ÷ 7 = 1.
Hide the answers out of order
In order the answers only count 1, 2, 3, so a quiz proves little. Open More options and set Order of the facts to Mixed up before New quiz. Then the slip shows: a child who writes 8 for 1 × 7 has added, since 1 + 7 = 8.
- On a 12 by 12 chart, 2, 3, 5, 7 and 11 sit only in the 1 row and column.
- Keep the two rule tables apart: 0 × 7 = 0, but 1 × 7 = 7.
Questions and answers
What is the 1 times table?
It is the list 1 × 1 = 1, 1 × 2 = 2, 1 × 3 = 3 and on to 1 × 12 = 12. The answers are the counting numbers in order, because one group of a number is that number.
Why does multiplying by 1 not change a number?
1 × 9 means one group of 9, and one group of 9 is 9 things. The name for this is the identity property of multiplication: anything multiplied by 1 is itself.
What is 1 × 0?
0. One group of nothing is nothing, and the rule still holds, since the other number is 0. Multiply any number by 0 and you get 0, which is called the zero property.
Is 1 × 7 the same as 1 + 7?
No. 1 × 7 is one group of 7, which is 7. 1 + 7 is 7 and one more, which is 8. Multiplying by 1 never changes the number; adding 1 always makes it one bigger.