Applying what we know from the pattern of multiplying by 10, add a zero to 12.

Applying what we know from the pattern of multiplying by 100, add two zeros to 12.

Step 1: Write the second number under the first number so that the corresponding places are lined up.

Step 2: Multiply the bottom number by the ones digit in the top number
(9 × 8 = 72). Since 72 has two digits, both digits won't fit in the ones place. So, write the 2 in the ones place of the product, and carry the 7 to the tens column.

Step 3: Multiply the bottom number by the tens digit in the top number
(9 × 8 = 72). Then, add the 7 that was carried to the tens column in the previous step (72 + 7 = 79).
Since 79 has two digits, both digits won't fit in the tens place. So, write the 9 in the tens place of the product, and carry the 7 to the
hundreds column.

Step 4: Multiply the bottom number by the hundreds digit in the top number (9 × 1 = 9). Then, add the 7 that was carried to the hundreds column in the previous step (9 + 7 = 16). Write the 6 in the hundreds place and the 1 in the thousands place of the sum.

Step 1: Write the second number under the first number so that the corresponding places are lined up.

Step 2: Multiply the ones digit in the bottom number by the ones digit in the top number (9 × 8 = 72). Since 72 has two digits, both digits won't fit in the ones place. So, write the 9 in the ones place, and carry the 7 to the tens column.

Step 3: Multiply the ones digit in the bottom number by the tens digit in the top number (9 × 8 = 72). Then, add the 7 that was carried to the tens column in the previous step (72 + 7 = 79). Write the 9 in the tens place and the 7 in the hundreds place.

Step 4: Start a new line, and add a placeholder zero to the ones column. Then, multiply the tens digit in the bottom number by the ones digit in the top number (3 × 8 = 24).
Since 24 has two digits, both digits won't fit in the tens place. So, write the 4 in the tens place, and carry the 2 to the tens column.

Step 5: Multiply the tens digit in the bottom number by the tens digit in the top number (3 × 8 = 24). Then, add the 2 that was carried to the hundreds column (24 + 2 = 26). Write the 6 in the hundreds place and the 2 in the thousands place.

Step 6: Add to find the product (792 + 2,640 = 3,432).