Write your double-digit multiplication problem out so that the place values are lined up with each other. In traditional multiplication, the multiplicand is written on top and the multiplier is written on the bottom.
Multiply the ones place of the multiplier by both the ones place and 10s place of the multiplicand. If the product of the ones place of the multiplicand and the multiplier is greater than 10, write the value of the ones place in the answer box and carry the 10s value over and add it to the product of the ones place of the multiplier and 10s place of the multiplicand. For example, if you are multiplying 27 x 14, the product of the ones places, 7 x 4 would be 28. You would write the 8 in the answer space and carry the 2 and add it to the product of 2 x 4, then write that answer in the answer space.
Write a zero in the answer space, on the second line, in the ones place. Because you will now be multiplying the 10s place value of the multiplier you write a zero to remind yourself to begin writing your answer in the 10s place on the second line of the answer space. Using the example in Step 2, you will be multiplying 1 x 7 and writing that product to the left of your zero in the 10s place, then you will be multiplying 1 x 2 and writing that product in the 100s place. This helps you to keep the place values lined up when you go to add up the products for your final answer.
Add the two products in your answer space together to get the total product for the double-digit multiplication problem. First, add your ones place values, 8 and 0, together and you get 8. Then, add your 10s place values, 0 and 7, and you get 7, and finally, add your 100s place values, 1 and 2, and you get 3. Your final answer after adding your products together should be 378.