Important Note about Two Digit Number Addition

Important Note about 2 digit numbers- Please do not have your child do math where they are carrying a number over. I am teaching it to them in a different way, called partial sums algorithm. Partial sums is a better way to develop number sense.

A "Family Note" is on Home Links 4.9 explaining how this works.

Here is an example.

    42                          First I have them add the numbers in the "one's" place. 2+9 = 11. They write
+  39                          11 under the equal line. Then they look to the "ten's" place. 40+30 =70. They
---------                       write 70 under 11. They now have the sums of the "ones" and the sums
    11                           of the "tens". We have broken the number up into tens and ones. Then add
+  70                           the two sums together. It makes for an easier addition problem.
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    81