Math: Addition - Flashcards
Memorize the sums for the following addition sentences in each set. When you feel that you have mastered them, try the Timed Drills in the Tutorial section of this page.
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A Fun Fact:
Since both numbers being
added are addends, the order
is not important. The sum will
be the same.
For example:
2 + 5 = 7
and
5 + 2 = 7
So, by knowing that 2 + 5 = 7,
we also know that 5 + 2 = 7.
The sums in this set are even numbers.
Even numbers are numbers that
can be divided into two equal groups or pairs.
For example: The number 6 is an
even number.
This means if you have six marbles, you could share them with two friends equally.
Let's take a look:
Friend A: 3 marbles
Friend B: 3 marbles
Both friends have an equal amount of marbles.
Another way to look at it is even
numbers can be divided by 2
evenly or equally.
We will take a closer look at
division in our Division Tutorial.
The sums in this set are odd numbers.
Odd numbers are numbers that
cannot be divided into two
equal groups or pairs.
For example: The number 5 is
an odd number.
This means if you have five
marbles, you could not share
them with two friends equally.
Let's take a look.
Friend A: 2 marbles
Friend B: 3 marbles
Notice that Friend A has less
marbles than Friend B.
The sums in this set are even
numbers. They can be divided
into two equal group or pairs.
The sums in this set are odd numbers.
Set 1
Set 2
Set 3
Set 4
Set 5
Set 6
Set 7
Set 8
Set 9
The sums in this set are even numbers.
The sums in this set are odd numbers.
Do you see a pattern?
Just for fun!
Can you guess what the next
set of sums will be?
Even or odd.
Here's why:
All of the numbers in our sets are listed from the smallest to the largest. (0, 1, 2, 3...)
Since our second addend in Set 2 is an odd number, the sums in our set are odd. As shown below, the second addend 1 is an odd number. Therefore, our sums 1, 3, and 5 are odd numbers.
0 + 1 = 1
1 + 2 = 3
2 + 3 = 5, and so on.
Since our second addend in Set 3 is an even number, the sums in our set are even. The second addend 2 is an even number. Therefore, our sums 2, 4, and 6 are even numbers.
0 + 2 = 2
1 + 3 = 4
2 + 4 = 6, and so on.
If you guessed even, you are correct!
The sums in this set are even numbers.
Let's take a look at the parts of an
addition sentence.
The green numbers are addends.
The orange numbers are sums.
Set 10
Once you have memorized the addition sentences in each set and can say them without making any errors, click on the Timed Drills link below to test
your skills.
0 + 0
1 + 1
2 + 2
3 + 3
4 + 4
5 + 5
6 + 6
7 + 7
8 + 8
9 + 9
10 +10
0
2
4
6
8
10
12
14
16
18
20
0 + 2
1 + 3
2 + 4
3 + 5
4 + 6
5 + 7
6 + 8
7 + 9
8 + 10
2
4
6
8
10
12
14
16
18
0 + 1
1 + 2
2 + 3
3 + 4
4 + 5
5 + 6
6 + 7
7 + 8
8 + 9
9 + 10
1
3
5
7
9
11
13
15
17
19
0 + 3
1 + 4
2 + 5
3 + 6
4 + 7
5 + 8
6 + 9
7 + 10
3
5
7
9
11
13
15
17
0 + 4
1 + 5
2 + 6
3 + 7
4 + 8
5 + 9
6 + 10
4
6
8
10
12
14
16
0 + 5
1 + 6
2 + 7
3 + 8
4 + 9
5 + 10
5
7
9
11
13
15
0 + 6
1 + 7
2 + 8
3 + 9
4 + 10
6
8
10
12
14
0 + 7
1 + 8
2 + 9
3 + 10
7
9
11
13
0 + 8
1 + 9
2 + 10
8
10
12
0 + 9
1 + 10
9
11
0 + 10
10
And
