To multiply large numbers, stack the first number on top of the second. Then multiply each digit of the bottom number, from right to left, by the top number. In other words, first multiply the top number by the ones digit of the bottom number.
When we multiply three or more numbers together, we start by multiplying any two factors first. Next, we multiply this product by another factor. If there are more than three numbers, we keep going until we have multiplied all the factors.
Step 1: Multiply the one’s digits together. Write down the answer below the ones place. Step 2: Multiply the diagonals and add them together. … Step 3: Multiply the digits in the ten’s column together and write the number to the left of the previous value.
In practice, the method of cross-multiplying means that we multiply the numerator of each (or one) side by the denominator of the other side, effectively crossing the terms over: The mathematical justification for the method is from the following longer mathematical procedure.
To multiply any number by 4, double the number and then double that product. To multiply any number by 5, multiply it by 10 and then divide the result in half. To multiply any number by 6, multiply it by 5 and then add one more set of that number. To multiply any number by 8, double the number.
There’s no special rule for multiplying by 6. You just have to remember this. When you multiply an even number by 6, the last digit of the answer is the same as the number that’s being multiplied.
When you multiply two negative numbers or two positive numbers then the product is always positive. 3 times 4 equals 12. Since there is one positive and one negative number, the product is negative 12. Now we have two negative numbers, so the result is positive.
It doesn’t much matter what else is going on, anything you multiply with zero will equal zero.
stacked multiplication calculator
stacked multiplication worksheet
how to do long multiplication with 2 digits
how to multiply decimals
how to multiply
how to multiply multiple numbers
how to do multiplication algorithm
how to do long division