Quickly multiply any two two-digit numbers up to 20 x 20.

Example

{% scaleimage "l1_example.png" "float_right" %}

Step 1

Add the one's place digit from the smaller number to the larger number.

17 + 2 = 19

Step 2

Add a zero to the end.

{% scaleimage "l1_step2.png" %}

Step 3

Multiply the one's place digit of the two numbers.

7 x 2 = 14

Step 4

Add the results of steps 2 and 3 for the answer.

190 + 14 = 204

{% scaleimage "l1_answer_splash_1.png" %}