 # Math

January 25-30, 2009 *************************************************************

Our students will be learning and working with subtraction. Students will be subtracting 1 and 2-digit numbers from a 2-digit number. Students will be introduced to the concept using hands-on manipulatives. Eventually, the child should solve the problem using paper and pencil as follows:

Given the problem:                                                                                                                                             43

-15

Step 1: The student will subtract the bottom number in the "Ones" column from the top number. In this case, the 5 is subtracted from the 3. This cannot be done.

Step 2: The student will then look at the whole numeral "43" as a whole. They will then break one of the "10's" in the "43" up to use for the 3. This will provide 13 "ones" to use to subtract 5 "ones" from. This will leave the problem looking as follows:

3 13

4 3

- 1 5

Step 3: The student will then be viewing his/her first step to do as "13- 5". This will leave an answer of 8, (Using the fingers to count on for this is typical). The child then puts the 8 that are left in the "Ones" column on their paper:

3  13

4  3

- 1 5

8

Step 4: Our final step is to subtract the bottom number from the top number in the ones column. In this case, we are subtracting 30 -10. The child is left with 20, or 2 "Tens". This answer will go in the "tens" column.

3 13

4 3

-1 5

2 8

January 19- 23, 2009 ************************************************************

Our students are working on addition. The students are given mathematical problems in which they have to add two two-digit numerals; sometimes regrouping is necessary.

For example, a student will see a problem such as this:

28 + 46=

Step 1 The child will then be required to arrange the 2-digit addition exercise horizontally such as follows:       28
+ 46

Step 2 Once the exercise is properly arranged, the student then adds the numbers in the "Ones" Column (to the far right) together. In this specific problem, that would be to add the 8 and the 6. The answer to 8 + 6 is 14.

Step 3 The child now needs to place the 4 in the "Ones" column and place the 1, representing the 10, into the "Tens" Column as follows:                                                                                                                                                         1
28
+ 46
4

Step 4 Our final step is to add the numbers that are in the "Tens" Column, these numbers are 2 + 4 + 1. This equals 7, and that is put into the "Tens" Column.

1
28
+ 46
74