Exercises: addition of natural numbers

With these exercises you will train adding natural numbers. Can you do them all?

1
Count the following single-digit numbers together.
$2 + 5$

For this task you need the following basic knowledge: Addition
$2 + 5$
$2 + 5 = 7$

$4 + 7$

For this task you need the following basic knowledge: Addition
$4 + 7$
$= 11$

$8 + 9$

For this task you need the following basic knowledge: Addition
$8 + 9$
$= 17$

$5 + 7$

For this task you need the following basic knowledge: Addition
$5 + 7 = 12$
$\circ \circ \circ \circ \circ + \circ \circ \circ \circ \circ \circ \circ$ $= \circ \circ \circ \circ \circ \circ \circ \circ \circ \circ \circ \circ$
2
Add the one- or two-digit numbers in your head.
$24 + 3$

For this task you need the following basic knowledge: Addition
Imagine $24 + 3$ as $24$ blue and $3$ red dots. How many dots do you have in total?
$24 + 3 = 27$

$6 + 55$

For this task you need the following basic knowledge: Addition
Think of the calculation as a picture with $6$ red circles and $55$ yellow stars.
Count the symbols!
$55 + 6 = 61$

$35 + 18$

For this task you need the following basic knowledge: Addition
Imagine the calculation as a picture with $35$ purple triangles and $18$ blue diamonds.
Count the symbols:
Insgesamt:
$35 + 18 = 53$
3
Select all terms which are equivalent to 78.
48+30
17+ 61
45+22
63+16

For this task you need the following basic knowledge: Addition
Solve this problem by calculating all the sums:
$17 + 61 = 78$ , and thus a valid term.
$45 + 22 = 67$ , and therefore not a solution.
$63 + 16 = 79$ , and therefore not a solution.
$48 + 30 = 78$ , and thus a valid term.
4
Select all terms whose value is 127.
$45 + 82$
$101 + 26$
$13 + 114$
$111 + 26$

For this task you need the following basic knowledge: Addition
Calculate all sums:
$13 + 114 = 127$ , and thus a valid term.
$111 + 26 = 137$ , and therefore not a solution.
$45 + 82 = 127$ , and thus a valid term.
$101 + 26 = 127$ , and thus a valid term.
5
Add the following two-digit numbers.
$43 + 22$

For this task you need the following basic knowledge: Addition
$43 + 22$
First add the 10s.
$40 + 20 = 60$
Now add the 1s of the first number.
$60 + 3 = 63$
And now the 1s of the second number.
$63 + 2 = 65$

$28 + 53$

For this task you need the following basic knowledge: Addition
$28 + 53$
First add the 10s.
$20 + 50 = 70$
Add the 1s of the first number.
$70 + 8 = 78$
To do this, add the 1s of the second number.
$78 + 3 = 81$

$17 + 83$

For this task you need the following basic knowledge: Addition
$17 + 83$
First add the 10s.
$10 + 80 = 90$
Add the 1s of the first number.
$90 + 7 = 97$
To do this, add the 1s of the second number.
$97 + 3 = 100$
6
Tina buys 5 packs of gummy bears for $$ 3$ each and 2 bars of chocolate for $$ 5$ each. How much does she have to pay?
$$ 25$
$$ 23$
$$ 15$
$$ 20$

For this task you need the following basic knowledge: Addition
Calculate how much she pays for the gummy bears (in $).
$3 + 3 + 3 + 3 + 3 = 15$
Calculate how much she pays for the chocolate.
$5 + 5 = 10$
Add the two results.
$10 + 15 = 25$
So Tina has to pay $$ 25$ .
7
There are $13$ boys and $11$ girls in class 5b. How many children are in the class in total?

For this task you need the following basic knowledge: Addition
Add the number of boys and the number of girls:
$13 + 11 = 24$
There are $24$ children in the class.
8
Tim has $37$ pencils. For his birthday, he gets $18$ pencils from his grandma and $7$ from Leo. How many pencils does he have after his birthday?

For this task you need the following basic knowledge: Addition
Add up the pencils he gets for his birthday.
$18$ + $7$ = $25$
Add thenew pencils to the ones Tim already had before his birthday.
$37$ + $25$ = $62$
Now Tim has $62$ pencils.
9
Clara is $12$ years old. She has a big sister who is $17$ years old and a little brother who is $9$ years old. How old are the three of them together?
38
29
39
28

For this task you need the following basic knowledge: Addition
Add Clara's age and that of her sister.
$12$ + $17$ = $29$
Now add the age of the brother to the result.
$29$ + $9$ = $38$
The 3 siblings are together 38 years old.
10
Tom is very diligent today. He has already solved $36$ addition tasks and $27$ subtraction tasks. How many problems has he solved in total?
63
9
59
62

For this task you need the following basic knowledge: Addition
How many problems did Tom solve?
Add up the sums of the two problem types.
$36 + 27 = 63$ $\Rightarrow$ Tom has already solved $63$ problems.
11
Laura, the bookworm, has started a new book. In the first few days she has already read $118$ pages. Next week she will read another $234$ pages. Now there are $13$ pages left. How many pages does the book have in total?
365
355
265
368

For this task you need the following basic knowledge: Addition
Laura read $118$ pages on the first day and $234$ pages on the second day. In total, she has read $118 + 234 = 352$ pages on the first two days.
There are still $13$ pages missing. So the book has a total of $352 + 13 = 365$ pages.
12
Add the following numbers by written addition.
$66 + 91$

For this task you need the following basic knowledge: Written method of addition
$\begin{array}{l} 6 6 \\ +_{1} 9 1 \\ 1 5 7 \end{array}$

$42 + 78$

For this task you need the following basic knowledge: Written method of addition
$\begin{array}{l} 4 2 \\ +_{1} 7_{1} 8 \\ 1 2 0 \end{array}$

$63 + 80$

For this task you need the following basic knowledge: Written method of addition
$\begin{array}{l} 6 3 \\ +_{1} 8 0 \\ 1 4 3 \end{array}$