Long Multiplication: 780 × 4
What is 780 × 4?
Answer
780 × 4 and 4 × 780 are the same product — the order of the factors never changes the answer, only the working. Below, 780 is multiplied by 4 in a column, digit by digit.
780 × 4 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.
| 7 | 8 | 0 | ||
| × | 4 | |||
| 3 | 1 | 2 | 0 |
Step-by-Step Solution
Step 1: Multiply the multiplicand by the last digit of the multiplier, 4: 780 × 4 = 3,120.
- 0 × 4 = 0. Write 0.
- 8 × 4 = 32. Write 2 and carry 3.
- 7 × 4 = 28, plus the carried 3 makes 31. Write 1 and carry 3.
- No digits are left, so the carried 3 is written in front: the partial product is 3,120.
780 × 4
=3,120
Check It, and What It Is Not
Check by dividing back. Multiplication and division undo each other, so 3,120 ÷ 4 = 780 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.
780 × 4 is a number, not an area. If those are the sides of a room in feet, the answer is 3,120 square feet — the same arithmetic, a different question, and it is answered by the square footage calculator.
Related Calculations
See Also
- Times Table Chart - Any number from 1 to 100, rows from ×1 to ×12
- 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/780--4">780 × 4 = 3,120 - Long Multiplication - Calculatio</a>