Math
Addition Concepts
The children may continue to master addition
concepts by drawing two sets and bringing them
together or use some type of counters.
(buttons, coins, pieces of candy or cereal, etc.)
Another way to add is by using the
number line.
When adding the number sentence
5 + 2 =
Go to 5 on the number line and take 2 steps forward
and you will land on 7.
5 + 2 = 7
Develop the concept of always starting with the larger number,
whether the number sentence is
5 + 2 or 2 + 5.
(When we begin with subtraction skills, the concept of always starting with the larger number
will already be mastered).
Double and Doubles + 1
Note: Numbers in bold are doubled
Vocabulary
Doubles fact- Both addends are the same
5 + 5 = 10
Doubles + 1- Double the lesser number and add 1 to that sum.
4 + 5 = 9
4 +4 = 8 and 8 + 1 = 9
Memorize these addition facts:
0 + 0 = 0
1 + 1 = 2
2 + 2 = 4
3 + 3 = 6
4 + 4 = 8
5 + 5 = 10
6 + 6 = 12
Three Addends
Concept: Only 2 numbers can be added at a time.
Note: All numbers in bold are the first step (combination of 2 numbers).
4-->4 + 1 = 5
1
+2-->5 + 2 = 7
_______
7
4-->4 + 3 = 7
1
+2-->1 + 2 = 3
_______
7
4-->4 + 2 = 6
1-->1 + 6 = 7
+2
_______
7
Subtraction Concepts
Vocabulary- minus
Develop subtraction as the separating or taking away.
The main idea for the children to understand is...
"How many are left?"
Use counters or drawings, start with a whole set and take away.
5 - 3 = 2 How many are left?
(read as: 5 minus 3 equals 2)
If using a number line, count backward.
ALWAYS subtract from the larger number.
Think in Tens
To Express numbers to 100 as tens and ones.
2 tens and 7 ones = 27 5 tens and 4 ones = 54
1 ten and 2 ones = 12 4 tens and 0 ones = 40
6 tens and 1 one = 61 9 tens and 9 ones = 99
To compare 2- digit numbers using symbols
is less than is equal to is greater than
< = >
73 > 48 73 is greater than 48
17 < 71 17 is less than 71
62 = 62 62 is equal to 62
To order numbers to 100 and identify the numbers just before, between, and just after.
27, ____, ____, 30, ____, 32, ____, ____ , ____, 36
75, ____, 77, ____, ____, ____, 81, ____, 83
After Before Between
94 ____ ____ 50 37 ____ 39
40 ____ ____ 68 19 ____ 21
Even and Odd Numbers
Even numbers end with 0 2 4 6 8
Odd numbers end with 1 3 5 7 9
Count by 2s
2 4 6 8 10 12 14 16 18 20
22 24 26 28 30 32 34 36 38 40
42 44 46 48 50 52 54 56 58 60
62 64 66 68 70 72 74 76 78 80
82 84 86 88 90 92 94 96 98 100
Count by 5s
5 10 15 20 25 30 35 40 45 50
55 60 65 70 75 80 85 90 95 100
Count by 10s
10 20 30 40 50 60 70 80 90 100
