The worked example
- Input
- 348 × 27
- Expected output
- 9396
2,436 + 6,960; check: 9,396 ÷ 27 = 348.
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how to set up a multiplication problem
To set up a multi-digit multiplication, write one number under the other, lined up on the right, and multiply the top one by each digit of the bottom one, from right to left. The calculator opens with 348 × 27 already set up, and the step by step shows each carry.
2,436 + 6,960; check: 9,396 ÷ 27 = 348.
Rows 615 and 492 (shifted): 615 + 4,920.
Rows 25, 00 and 25.
15 × 25 = 375, with two decimal places.
It equals 1,000,000 − 2 × 1,000 + 1.
Start with the easy ones (1, 2, 5, 10), then use the rule that order does not matter: if you know 3 × 7 you already know 7 × 3. That leaves 36 distinct products between 2 and 9. Practice a few at a time, in short sessions of 10 to 20 facts, and let Practice repeat the ones you miss: it gives them more weight when drawing.
It does not matter, since multiplication does not depend on order. It is common to put the number with more digits on top and the smaller one below, to have fewer rows.
Because the bottom digit stands for tens, hundreds and so on. Multiplying by 2 in the tens place means multiplying by 20, and the shifted row keeps the missing 0 at the end.
Divide the product by one of the factors: the result must be the other factor. In 348 × 27 = 9,396, the division 9,396 ÷ 27 gives back 348.
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Related: Fraction calculator · Divisors of a number · GCD and LCM