To multiply two 2-digit numbers without showing work, first

Make sure to

**multiply the ones digits together**, then '**cross-multiply**,' and finally**multiply the tens digits together**.Make sure to

**carry whenever a product exceeds 9**. As you will see in the examples below, you must work your way from**right to left**to perform this trick.__Example 1:__12 x 23- Multiply the ones digits:
**2x3**=**6**(ones digit answer). - Cross-multiply and add:
**(1x3)+(2x2)=7**(tens-digit answer). - Multiply the tens digits:
**1x2=2**(hundreds-digit answer). - Combine:
**276**(the answer).

__Example 2:__31 x 24- Multiply the ones digits:
**1x4=4**(ones digits answer). - Cross-multiply and add:
**(3x4)+(1x2)=14**(use the 4 as the tens-digit answer, and carry the 1). - Multiply the tens digits, and add the 1:
**(3x2)+1=7**(hundreds-digit answer). - Combine:
**744**(the answer).

**Note:**This trick will also work on numbers with zeroes and decimal points. Also as you are cross-multiplying, it is generally easier to begin with the larger product and then add the smaller product.