Short multiplication

To multiply 237 by 4 without using a calculator, you can set it out like this:

Short multiplication diagram
  1. Start with 4 \times 7, which is 28, so write the 8 and carry the 2 to the tens column.
  2. 4 \times 3 = 12, but remember to add the carried 2 to get 14. Write the 4 and carry the 1 to the hundreds column.
  3. 4 \times 2 = 8, and we add the carried 1 to get 9.

Therefore:

237 \times 4 = 948

This method is called short multiplication.