Long Multiplication: 51 × 5
What is 51 × 5?
Answer
51 × 5 and 5 × 51 are the same product — the order of the factors never changes the answer, only the working. Below, 51 is multiplied by 5 in a column, digit by digit.
51 × 5 in a Column
The multiplicand goes on top, the multiplier underneath, both aligned on the right. The multiplier has a single digit, so there is one partial product and the answer goes straight under the line.
| 5 | 1 | ||
| × | 5 | ||
| 2 | 5 | 5 |
Step-by-Step Solution
Step 1: Multiply the multiplicand by the last digit of the multiplier, 5: 51 × 5 = 255.
- 1 × 5 = 5. Write 5.
- 5 × 5 = 25. Write 5 and carry 2.
- No digits are left, so the carried 2 is written in front: the partial product is 255.
51 × 5
=255
Check It, and What It Is Not
Check by dividing back. Multiplication and division undo each other, so 255 ÷ 5 = 51 must come out exactly, with no remainder.
Fractions are a different calculation. Both factors here are whole numbers; for 2/3 or 2 3/4 use the fraction multiplication calculator, which multiplies numerators and denominators separately.
51 × 5 is a number, not an area. If those are the sides of a room in feet, the answer is 255 square feet — the same arithmetic, a different question, and it is answered by the square footage calculator.
Related Calculations
See Also
- Long Division Calculator - Step-by-step long division with detailed explanation
- Multiplying Fractions Calculator - Multiply fractions, mixed numbers and whole numbers step by step
- Factors of a Number - List all Factors and Factor Pairs of a Number
- Greatest Common Factor - Find the Greatest Common Factor (GCF) of two numbers
- Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
<a href="https://calculat.io/en/number/long-multiplication/51--5">51 × 5 = 255 - Long Multiplication - Calculatio</a>