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2 Unit 2
2 Unit 2
Addition
Topic A: Addition
Addition puts amounts together. The answer of addition is called the sum or the total.
The plus sign + means to add.
+=
3+2=5says “three plus two equals five”
or “three and two is five”
The sum is 5.
You can count on your fingers to get the answers to addition questions, but counting takes too long.
Addition facts are a tool that you use to do adding questions.
Exercise OneCheck out your addition facts by doing this exercise as
quickly as possible without counting on your fingers. The highest total or sum (what the numbers add up to) for these number facts is 9. Check your work using the answer key at the end of the exercise. Then, make a list of any addition facts you do not know or which are slow – practice them.
|
a)2 + 4 |
b)3 + 1 |
c)1 + 2 |
d)7 + 0 |
|
6 |
4 |
|
|
|
e)0 |
f)1 |
g)5 |
h)3 |
|
+ 4 |
+ 4 |
+ 2 |
+ 3 |
|
i)2 |
j)6 |
k)4 |
l)3 |
|
+ 0 |
+ 3 |
+ 4 |
+ 0 |
Answers to Exercise One
|
m)5 |
n)1 |
o)0 |
p)8 |
|
+ 3 |
+ 6 |
+ 5 |
+ 1 |
|
q)2 |
r)1 |
s)1 |
t)2 |
|
+ 6 |
+ 0 |
+ 5 |
+ 2 |
|
u)3 |
v)2 |
w)5 |
x)1 |
|
+ 2 |
+ 1 |
+ 4 |
+ 7 |
|
y)9 |
z)5 |
aa) |
0 |
bb) |
4 |
|
+ 0 |
+ 1 |
|
+ 3 |
|
+ 1 |
|
a) |
6 |
b) |
4 |
c) |
3 |
d) |
7 |
e) |
4 |
f) |
5 |
g) |
7 |
|
h) |
6 |
i) |
2 |
j) |
9 |
k) |
8 |
l) |
3 |
m) |
8 |
n) |
7 |
|
o) |
5 |
p) |
9 |
q) |
8 |
r) |
1 |
s) |
6 |
t) |
4 |
u) |
5 |
|
v) |
3 |
w) |
9 |
x) |
8 |
y) |
9 |
z) |
6 |
aa) |
3 |
bb) |
5 |
Exercise TwoCheck out your addition facts by doing this exercise as
quickly as possible without counting on your fingers. The highest total or sum (what the numbers add up to) for these number facts is 9. Check your work using the answer key at the end of the exercise. Then, make a list of any addition facts you do not know or which are slow – practice them.
|
a)4 + 5 |
b)1 + 8 |
c)8 + 0 |
d)4 + 3 |
|
9 |
9 |
|
|
|
e)0 |
f)2 |
g)7 |
h)0 |
|
+ 0 |
+ 3 |
+ 1 |
+ 9 |
|
i)4 |
j)0 |
k)0 |
l)1 |
|
+ 2 |
+ 2 |
+ 7 |
+ 1 |
|
m)2 |
n)0 |
o)6 |
p)0 |
|
+ 7 |
+ 1 |
+ 2 |
+ 6 |
|
q)1 |
r)3 |
s)2 |
t)0 |
|
+ 3 |
+ 5 |
+ 5 |
+ 8 |
|
u)3 |
v)4 |
w)3 |
x)5 |
|
+ 4 |
+ 0 |
+ 6 |
+ 0 |
|
y)6 |
z)6 |
aa) |
7 |
bb) |
0 |
|
+ 1 |
+ 0 |
|
+2 |
|
+ 3 |
|
a) |
9 |
b) |
9 |
c) |
8 |
d) |
7 |
e) |
0 |
f) |
5 |
g) |
8 |
|
h) |
9 |
i) |
6 |
j) |
2 |
k) |
7 |
l) |
2 |
m) |
9 |
n) |
1 |
|
o) |
8 |
p) |
6 |
q) |
4 |
r) |
8 |
s) |
7 |
t) |
8 |
u) |
7 |
|
v) |
4 |
w) |
9 |
x) |
5 |
y) |
7 |
z) |
6 |
aa) |
9 |
bb) |
3 |
Answers to Exercise Two
Exercise ThreeCheck out your addition facts by doing this exercise as
quickly as possible without counting on your fingers. The highest total or sum (what the numbers add up to) for these number facts is 9. Check your work using the answer key at the end of the exercise. Then, make a list of any addition facts you do not know or which are slow – practice them.
|
a)3 + 6 |
b)4 + 5 |
c)4 + 1 |
d)9 + 0 |
|
9 |
9 |
|
|
|
e)2 |
f)3 |
g)0 |
h)5 |
|
+ 2 |
+ 4 |
+ 6 |
+ 2 |
|
i)4 |
j)1 |
k)2 |
l)0 |
|
+ 0 |
+ 8 |
+ 3 |
+ 5 |
|
m)0 |
n)1 |
o)4 |
p)6