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22 May 2014

# How to Teach Doubling and Halving Numbers for KS1

Info Post
Maths is an important subject in a child's basics year even before they start their foundation. Most often  it is the mom who sits with her child to teach them the basics of Maths. In their KS1, knowing the number bonds, doubling and halving numbers and basics numbers functions along with number problems forms an integral part of their learning.

Teaching maths to my kids who are in reception and Year 2 made me revise my basics and even come up with my own tricks of using my maths skills to come up with a precise answer. And I hope sharing these tips both of what I had seen using in school as well as my own tips will definitely come in handy to all parents who look for some help with their child's KS1 learning.

## Doubling of a Number using Mr and Mrs Half (used in schools)

 Teaching Doubling for Kids using Mr. and Mrs. Half
 Teaching Doubling for Kids
Mr. and Mrs. Half : This method is quite popular in schools. For any two digit numbers, we have to draw equal number of squares such as Mr. & Mrs. Half. Then, you have to count them together under the tens and units place to get the required doubles.

If there are carry overs, just add them to the tens place for getting the doubles.

## Halving Numbers using Crack-it-up method ( my own method)

 Teaching Halving for Kids
 Teaching Halving for Kids
Crack it up method - Place square bars equal to the given number. We have three bars under the number 3 and eight bars under the number eight. Now, place dots and cross simultaneously such as one dot should equal to one cross. By this, we are eliminating the crosses and counting only the dots gives us the exact halves. But sometimes, for odd numbers we are left with a bar with neither uses dots or crosses. In this case, we crack the bar into half (0.5) to make them equal on both sides. This when taken from tens place is added to ones place as 5 to get the correct halves.

If we get (0.5) in ones place, it just remains the same. Example: Halves of 25 = 12.5

The above crack- it up method as we found was quite effective with kids while dealing with halving any double digit numbers. Hope you liked this post :)

Note: Normally schools teach using number facts or division for halving numbers.While trying to use the number bonds, I accidentally derived upon the above "crack-it up method" and thus shared what I know to those who are interested in learning yet another method in solving a problem.

Share:

1. Nice idea !

2. Wow, crack it up method u found! Nice :)
Neatly explained..

1. Yes I did it Bhawya :)

3. Great idea..I think this would really work..

1. It sure works ...just try them in your casual time

4. its really a nice idea that u have found !

5. thank you for sharing the idea... i was finding halving quite difficult with my kids... i m sure that if i use this method it would be very easier for my kids and they would just love this method... tmrw i m gonna use this method with my kids

6. how to half bigger numbers like 70 using this method

1. Tomsreni,the method is same for 70 as well. For the 7 (in tens place) we would have 3 dots , 3 crosses and one crack (which passes to unit place as 5). So, the unit becomes, 0+5 = 5.

So answer is now 3 (counting dots in tens place) | 5 (units place) = 35.

Hope you got it :)

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