43 × 15 = 645. First, set up the long multiplication. Second, calculate 3 × 5, which is 15. Since 15 is two-digit, carry the first digit 1 to the next column. Third, calculate 4 × 5 which is 20. Since 21 is two-digit, carry the first digit 2 to the next column. Fourth, bring down the carry digit of 2. Fifth, calculate 3 × 1, which is 3. Sixth, calculate 4 × 1, which is 4. Seventh, calculate 215 + 430, which is 645. Eighth, therefore, 43 × 15 = 645.
Or.. an easier way is to use a calculator. They always come in handy when doing multiplication.
