How do you do manual multiplication

In the table below you will find the numbers 0 through 9 across the top and again down the left side. To multiply 4 x 3, locate the four on the top row and the three along the left side and follow both until the row and column intersect. The number in that cell is Let us say we want to multiply. × First we multiply × 4 (=2,), then we multiply × 20 (=12,), and last we add them together (2, + 12, = 14,). But we can do better! When we multiply × 20 we only need to multiply × 2 and place the result one column over (so it is the same as multiplying by 20).  · Step-by-step guide to long multiplicationAuthor: Farouq Taj.

Step 1: Starting in the right-hand column (units) multiply 4 and 3. You can refer to the multiplication table above if Step 2: Next we multiply the 4 by the next number across, which is 2 (or 20, because it is in the tens column). Write Step 3: In the steps above, we have multiplied the units. Taking a Shortcut 1. Write down the problem. Let's say you're multiplying times Write it down. One number should be right next to 2. Split up the smaller number into tens and ones. Keep and split up 12 into 10 and 2. The 1 is in the tens digit, 3. Multiply the larger number by the. Multiply the ones digit of the bottom number to the next digit to the left in the top number. If you carried a digit, add it to the result and write the answer below the equals line. If you need to carry again, do so. When you've multiplied the ones digit by every digit in the top number, move to the tens digit in the bottom number.

This is the usual algorithm for multiplying larger numbers by A person doing long multiplication on paper will write down all. Do so if you need to hold it again. Moving to the tens digit in the bottom number when you have multiplied the one digit by every digit in the top number. To do long multiplication quickly, start by splitting up the tens and ones place in the smaller number. For example, if the number was 12, you would end up with.