Math

We are working on a number unit that includes adding and subtracting two-digit numbers and place value (hundreds [soon], tens, and ones).

Students are also expected to continue mastering their addition combinations and related subtraction facts throughout the year. Below you will find the sets of combinations.  If your child has lost their original set or needs another set for a different household, etc., please have them make new sets for themselves from these lists on index (or similar) cards.  The answers should NOT be on the front of the card, but a clue may be included if that is helpful.  They may put answers on the back to check themselves if they like.  If they do put answers on the back, please check them so they are learning the combinations correctly. :)


Thanks,


Jenny B.




  Set 1  Addition (+1, +2, Make 10s) YELLOW
(All the children have the +1 and +2 combinations, but some are still working on the "Makes 10" combos.  PLEASE HELP YOUR CHILD MASTER THESE IF THEY HAVEN'T.
1+1,1+2, 2+1,1+3, 3+1,1+4, etc., up to 10
 9+1, 1+9
8+2, 2+8
7+3, 3+7
6+4, 4+6
5+5

Set 1 Subtraction ~ (Subtraction Facts related to above combinations) ORANGE
2-1, 3-1, 4-1, 5-1, etc., up to 10 - 1, 3-2, 4-3, 5-4, 6-5, 7-6, 8-7, 9-8, 4-2, 5-2, 6-2, 7-2, 8-2, 9-2, 5-3, 6-4, 7-5, 8-6, 9-7, 10-9, 10-8, 10-7, 10-6, 10-5, 10-4, 10-3, 10-2, 10-1




Set 2 Addition ~ (Doubles) (I did not send these home.  Most doubles are mastered EXCEPT FOR THE FOLLOWING)


7+7, 8+8, 9+9

Set 2 Subtraction LIGHT PURPLE (Related to Doubles - I intersperse these combinations with another subtraction set when I'm giving them to the students because instead of learning them, many children just say the last number they hear in the problem, i.e., 8-4=__ They say "4" because they know the pattern of these problems rather than the actual solution to the problem... if that makes sense to you...).
2-1, 4-2, 6-3, 8-4, 10-5, 12-6, 14-7, 16-8, 18-9, 20-10

Set 3 Addition (Near Doubles or Doubles +1) LIGHT GREEN
3+4, 4+3, 4+5, 5+4, 5+6, 6+5, 6+7, 7+6, 7+8, 8+7, 8+9, 9+8, 9+10, 10+9