Quick Answer: How Do You Multiply By Multiples Of 10?

Is there a rule you can make for multiplying a number by a multiple of 10?

Number and Operations in Base Ten Now students will multiply using a multiple of 10 in the range 10–90.

For example, the product of 4 × 80 can be shown as 4 groups of 8 tens, or 32 tens, or 320.

This is a representation of the Associative Property of Multiplication, because 4 × 80 = 4 × (8 × 10) = (4 × 8) × 10 = 320..

What can equal to 20?

If you can use more than one of a number, than 2 x 2 x 5 = 20. If you’re asking for 3 different numbers, than 1 x 4 x 5 = 20 or 1 x 2 x 10 = 20.

What multiplication makes 36?

36 = 1 x 36, 2 x 18, 3 x 12, 4 x 9, or 6 x 6.

What are multiples of 5?

The multiples of 5 are: 5,10,15,20,25,30,35,40,45,50,…

How do you multiply by 10?

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

What do you multiply to get 100?

Answer : 1,2,4,5,10,20,25,50,100, Related Links : Is 100 a rational number?

How do you multiply powers?

The exponent “product rule” tells us that, when multiplying two powers that have the same base, you can add the exponents. In this example, you can see how it works. Adding the exponents is just a short cut! The “power rule” tells us that to raise a power to a power, just multiply the exponents.

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).

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.

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 hundreds by tens?

Multiply the number in the tens place of the bottom number by the number in hundreds place of the top number. Multiply 3 times 7 to equal 21. Add the 1 you carried to equal 22. You don’t need to carry the 2 in 22, as there are no more numbers to multiply on this line, so you can just write it down next to the 6.

What are the factors of 18?

Table of Factors and MultiplesFactorsMultiples1, 2, 4, 8, 16161121, 17171191, 2, 3, 6, 9, 18181261, 191913341 more rows

Does the product of a multiple of 10 always have a zero in the ones place?

There is always a 0 in the ones place of the product when multiplying by a multiple of 10. Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the properties of operations.

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.

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 many factor pairs does 119?

119 is a composite number. 119 = 1 x 119 or 7 x 17. Factors of 119: 1, 7, 17, 119. Prime factorization: 119 = 7 x 17.

How do you teach multiplication by 10?

Teach that when you multiply by 10, you simply shift the digits one place to the left. A zero is used as a place holder. For example, when you multiply 3×10, you shift the digits one place to the left and get a product of 30. When you multiply 6×10, you shift the digits one place to the left to get the product of 60.

How do you multiply by hand?

These are the steps to do long multiplication by hand:Arrange the numbers one on top of the other and line up the place values in columns. … Starting with the ones digit of the bottom number, the multiplier, multiply it by the last digit in the top number.Write the answer below the equals line.More items…