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Double and halve

This article is about doubling and halving in math. The following content is offered here:

  • A Explanation for doubling and halving numbers.
  • It will Examples calculated for a better understanding.
  • You get tasks or. Exercises with sample solutions.
  • A Video explains fundamental relationships in mathematics.
  • A Question and answer area on the subject of doubling and halving.

We'll look at how to double or halve numbers in a moment. First of all, however, it is very important that students know the numbers from 1 to 20 and can count forwards or backwards. If you can't do this yet, please read the article counting up + down first. On this website we also offer similar articles such as neighbor numbers or plus tasks + minus tasks up to 20.

Explanation of doubling and halving

Sometimes math is about doubling or halving numbers. This is exactly what we would like to deal with in more detail here. Let's start with doubling: To do this, you take a number and add the same number to it again.

  • 1 + 1
  • 2 + 2
  • 3 + 3
  • 4 + 4
  • and so on.

When cutting in half, we reverse the step. We'll look at examples of doubling and halving right away. Before doing this, let's take a quick look at some of the mathematical backgrounds: Important: In 1st grade, multiplication and division are not normally used. Therefore only a short information about this follows.

Doubling:

Note:
A doubling is obtained by multiplying a number by 2.
Halving:
Note:
Halving is obtained by dividing (dividing) a number by 2.
Display:

Doubling and halving examples

Let's look at examples in this area of ​​math. Let's start with doubling.

Examples 1:

  • 2 + 2 = 4
  • 3 + 3 = 6
  • 4 + 4 = 8
  • 5 + 5 = 10
  • 6 + 6 = 12
  • 7 + 7 = 14
  • 8 + 8 = 16

We go the opposite way with the halving.

Examples 2:

  • 4 = 2 + 2
  • 6 = 3 + 3
  • 8 = 4 + 4
  • 10 = 5 + 5
  • 12 = 6 + 6
  • 14 = 7 + 7

In principle, you only have to be able to carry out simple additions here.

Doubling and halving tasks / exercises

Show:

Double + Halve video

Examples and explanations

In the next video I'll show you how to double or halve numbers. Various examples are calculated and explained.


Next video »

Doubling + Halving: Questions and Answers

In this area we look at typical questions and answers about doubling and halving numbers.

Q: Are there any books on doubling and halving numbers?

A: Yes there is. For example Math Stars 1 Basic Knowledge from the Oldenburg publishing house.

Q: How do you generally double or halve numbers?

A: You can double by multiplying by 2, halving by dividing by 2.

Q: What other topics should I check out?

A: Here is a list of important basic math topics: