## Monday, January 10, 2011

### Math Monday -- recognizing 6-10 as 5 + some units

One of the activities we did last week was to introduce how numbers can be written as the sum of 2 other numbers. More specifically, how the digits 6 - 10 can be written as a combination of 5 + another unit value.

For instance,
6 = 5 + 1
7 = 5 + 2
8 = 5 + 3
9 = 5 + 4
10 = 5 + 5

We used the hands cards that are mentioned below, for the math lesson. I was quite surprised to see that it was actually difficult for Aikman. He fully understood that there were 5 fingers on a hand, but when 6 fingers were held up, he would a) say that it was demonstrating 51 (you know... 5 fingers on the first hand and 1 finger on the second) or b) insist on counting each finger to get the answer, rather than seeing that he could just start counting at 5.

Luckily, others have already made several printables that are perfect for this....

The Linton Academy has some GREAT printables that are of a pair of hands that demonstrate the numbers 1-10 as well as tally mark cards (not shown above). When you click on the link, it is about 1/2 way down the page, under pre-math.

(I think I'll probably make her awesome idea for moveable tally sticks found on this post here.)

(photo credit: Heidi Songs)

Heidi Songs has a ten-frame that works on this particular type of grouping. The file is about 1/2 way down the page. There are some great combinations of dots that are besides this basic combination, but I think all of them are very usable.

Phyllis said...

I like the fact you use so many different materials.

An Almost Unschooling Mom said...

Ditto to Phylis' comment :) You really covered this well.

Joyful Learner said...

This is worth doing it again and again. Thanks for the great examples!