Dividing by 0.5: A Simple Method to Divide by a Half

Updated on October 9, 2016

How to Divide by 0.5

A quick way to divide by 0.5 or ½ is to double the number (or multiply number by 2). The reason for this is that two halves go into a whole. If you still can’t see why you double the number, just think about an easy example, such as, 3 ÷ 0.5. Go through your multiples of 0.5 until you reach 3:

0.5, 1, 1.5, 2, 2.5, 3...

As you can see 3 is the 6th multiple of 0.5, so the answer to 3 ÷ 0.5 is 6.

Another thing to remember is that when you divide by a decimal between 0 and 1 the answer is larger than the number that you started off with.

Let’s look at some harder questions that involve dividing by 0.5:

Example 1

Work out the answer to 26 ÷ 0.5.

All you need to do is double the number, as dividing by 0.5 is the same as multiplying by 2:

26 ÷ 0.5 = 26 × 2 = 52.

Example 2

Work out the answer to 57 ÷ 1/2:

Again all you need to do is double the original number, as dividing by ½ is the same as multiplying by 2:

57 ÷ ½ = 57 × 2 = 114.

Example 3

Find the value of 428 ÷ 0.5:

Again, double the number you are dividing:

428 + 428 = 856.

Example 4

Work out an estimate to 726.854 ÷ 0.478.

When carrying out an estimate round all the numbers off to 1 significant figure:

726.854 = 700

0.478 = 0.5

All you need to do now is work out 700 ÷ 0.5. Just like the last 3 examples this can be done by multiplying 700 by 2:

700 ÷ 0.5 = 700 × 2 = 1400.

So an estimate to the calculation 726.854 ÷ 0.478 is 1400.

Example 5

How many pieces of wood 0.5m long can be cut from a plank of wood of length 9m.

Here you need to work out how many 0.5’s go into 9:

9 ÷ 0.5 = 9 × 2 = 18

So 18 pieces of wood can be cut from the plank of wood.

Questions & Answers

  • What is 28 x 0.5?

    When multiplying by 0.5, you half the number, so 28 divided by 2 is 14.

  • What is 2.5 divided by 0.5?

    When dividing by a half (0.5) just double the number. So 2.5 doubled is 5.

  • What is 0.05 x 500?

    Convert 0.05 to a fraction to give 1/20. So you just need to divide 500 by 20, to give 25.

  • What is 15 divided by 0.5?

    When dividing by one-half double the number.

    15 multiplied by 2 is 30.

  • what is 0.0067 divided by 0.5?

    Just add 0.0067 to 0.0067 to give 0.0134 (or multiply 0.0067 by 2).

    Just remember dividing by 0.5 is the same as multiplying by 2.


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