Column multiplication
Multiply in columns: short multiplication by a 1-digit number with carried digits, long multiplication with two rows and a placeholder 0, and then decimals.
- UK: Year 3
- France: grade 3
- Germany: grade 3
- Iran: grade 3
- Afghanistan: grade 2
- Syria: grade 3
- Palestine: grade 4
- Ukraine: grade 3
- Russia: grade 3
Guide
In the column method (vertical layout) for multiplication, start with the ones column. Multiply each digit of the top number by the bottom number. If you get 10 or more, write the ones and carry the tens to the next column: write them small under the answer line.
Add the carried digit after you multiply: in 47 × 6, first 4 × 6 = 24, then 24 + 4 = 28. Never multiply the carried digit.
Long multiplication, like 67 × 32, has two rows: the first row is 67 × 2 and the second is 67 × 30. Because we multiply by 30, the second row starts with a placeholder 0 in the ones column. Then add the two rows.
To multiply a decimal (decimal number), multiply as if there were no decimal point. Then count the decimal places in the numbers you multiplied: the answer has the same number of decimal places.
Every digit you get right turns green. If you get stuck, press "Show me this column".