How can I teach my first grader to learn how to subtract by 10s?

Question

Her math is pretty good but she has a difficult time understanding this concept. What is the best way of helping her understand?

Answer 1

Get her a 100's chart. Then she can see all the number represented and you can use it to show her how to skip count.

Answer 2

A 100s chart is really a good way. It makes it easier for a child to see the numbers in relationship to one another. Does she understand the concept of adding 10? Because if she does it shouldn't be too difficult to subtract 10.

Answer 3

teach her that its the same as 1-9, except theres two digits for each number.

start with whole tens

3-2 is the same as 30-20, 1 and 10.

after they learn this concept, you can teach them that the second number (the one on the right that is in the 'ones' place) is like the helper number. it helps the left-hand digit (the digit in the 'tens' place)

in order to subtract from the tens place, you need to subtract from the once first.


so in 34
-12
----
you first subtract the 2 from 4, then you can subtract 1 from 3

then, you can talk about carrying over. when the bottom number (the one being taken away) has a greater number in the ones place, than the number above it.


23
- 19

Answer 4

Can she count backwards? If not, teach her. Then when she is subtracting (90-10=80 ---- she will automatically see that 9-1=8). You are basically teaching her to subtract by ONE and leaving the other digit, just in a different space.

Answer 5

A great way that would help is getting your one grader an abacus.

Answer 6

ok use things like her favorite candy and use like if i take away 10 how many do i have left

Answer 7

Get her a dollars worth of dimes and remove one at a time! :-)=

Answer 8

flash cards