Example 2 : First multiply 7 by 3. Since the product of 7 and 3 is greater than 9 (7 × 3 = 21), put the 1 in the ones place and carry 2 tens (20) to the tens place.

Now multiply 2 tens by 3. Remember to add the 2 tens that you carried (2 tens × 3 = 6 tens + 2 tens = 8 tens).