Quick Answer: How Do You Multiply By 10?

How do you multiply a number by 10?

To multiply any number by ten, just move the decimal point one place to the right..

Why do you put a 0 when multiplying?

No! There is one trick. When you multiply the second part, add a “0” to that answer, because you are multiplying the value from the tens column (the 2). If it’s from the tens, add a zero.

How many whole numbers are there between 19 and 42?

The first 100 whole numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, …

Why do you add a zero when multiplying by 10?

Why ‘adding zero’ is a problem From the outset, pupils need to grasp the idea that when you multiply by 10, 100, 1000 and so on, each digit shifts to the left on a place value table because they’re adding another place to the number.

How do you multiply by 20?

To multiply by TWENTY simply multiply by ten, and then DOUBLE your answer. This works because twenty is twice as big as ten. *Some people prefer to double the number FIRST, and then multiply by ten. These can also be done by multiplying by 100 or 1,000 FIRST, then doubling.

How do you multiply a number by 100?

How to multiply and divide by 0, 1, 10 and 100When you multiply by 1 the answer stays the same. 21 × 1 = 21.When you multiply by 10, move all the digits one place to the left, putting a zero in the empty space. 21 × 10 = 210.When you multiply by 100, move all the digits two places to the left, putting a zero in the empty spaces. 21 × 100 = 2100.

What can multiply to get 24?

Answer and Explanation: The factor pairs of 24 are: 1 x 24, 2 x 12, 3 x 8, and 4 x 6. When you find the factors of a number, you are looking for numbers that can be…

What are the rules in multiplying?

To multiply or divide signed integers, always multiply or divide the absolute values and use these rules to determine the sign of the answer:The product of two positive integers or two negative integers is positive.The product of a positive integer and a negative integer is negative.More items…

What happens every time you multiply a number by 10?

You’re multiplying by 10, which means you have one zero–your decimal point will be moving one place to the right. In the problem given, the decimal point falls after the 4, even though it is unwritten.

How do you multiply tens?

SHORTCUT for multiplying by whole tens and whole hundreds The same principle works if you multiply by whole tens (30, 40, 50, 60, 70, 80, or 90): simply multiply 2, 3, 4, 5, 6, 7, 8, or 9, and then tag a zero to the end result. zeros, and then tag the two zeros to the end result. 7. Multiply.

What are the multiples of 10?

How to list multiples of a number?Multiples of 11, 2, 3, 4, 5, 6, 7, 8, 9, 10, …Multiples of 99, 18, 27, 36, 45, 54, 63, 72, 81, 90, …Multiples of 1010, 20, 30, 40, 50, 60, 70, 80, 90, 100, …Multiples of 1111, 22, 33, 44, 55, 66, 77, 88, 99, 110, …Multiples of 1212, 24, 36, 48, 60, 72, 84, 96, 108, 120, …10 more rows

What are multiples of 5?

Multiples of 5 are: 5, 10, 15, 20, 25, 30, 35, 40, etc. Each multiple is created by multiply 5 times some other number. Factors are the numbers used to create a multiple.