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.
1. $2+5$
  
  For this task you need the following basic knowledge: Addition
  Do you have a question?
  Write it here 👉
2. $4+7$
  
  For this task you need the following basic knowledge: Addition
  $4+7$
  $= 11$
  Do you have a question?
  Write it here 👉
3. $8+9$
  
  For this task you need the following basic knowledge: Addition
  $8+9$
  $=17$
  Do you have a question?
  Write it here 👉
4. $5+7$
  
  For this task you need the following basic knowledge: Addition
  $5+7=12$
  $\circ\circ\circ\circ\circ+\circ\circ\circ\circ\circ\circ\circ$ $=\circ\circ\circ\circ\circ\circ\circ\circ\circ\circ\circ\;\circ$
  Do you have a question?
  Write it here 👉
2
Add the one- or two-digit numbers in your head.
1. $24+3$
  
  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?
  $24+3=27$
  Do you have a question?
  Write it here 👉
2. $6+55$
  
  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!
  $55+6=61$
  Do you have a question?
  Write it here 👉
3. $35+18$
  
  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:
  $35+18=53$
  Do you have a question?
  Write it here 👉
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.
1. $43+22$
  
  For this task you need the following basic knowledge: Addition
  $\textcolor{ff6600}{4}\textcolor{660099}{3}+\textcolor{009999}{2}\textcolor{cc0000}{2}$
  First add the 10s.
  $\textcolor{ff6600}{4}0+\textcolor{009999}{2}0=60$
  Now add the 1s of the first number.
  $60+\textcolor{660099}{3}=63$
  And now the 1s of the second number.
  $63+\textcolor{cc0000}{2}=65$
  Do you have a question?
  Write it here 👉
2. For this task you need the following basic knowledge: Addition
  $\textcolor{ff6600}{2}\textcolor{660099}{8}+\textcolor{009999}{5}\textcolor{cc0000}{3}$
  First add the 10s.
  $\textcolor{ff6600}{2}0+\textcolor{009999}{5}0=70$
  Add the 1s of the first number.
  $70+\textcolor{660099}{8}=78$
  To do this, add the 1s of the second number.
  $78+\textcolor{cc0000}{3}=81$
  Do you have a question?
  Write it here 👉
3. For this task you need the following basic knowledge: Addition
  $\textcolor{ff6600}{1}\textcolor{660099}{7}+\textcolor{009999}{8}\textcolor{cc0000}{3}$
  First add the 10s.
  $\textcolor{ff6600}{1}0+\textcolor{009999}{8}0=90$
  Add the 1s of the first number.
  $90+\textcolor{660099}{7}=97$
  To do this, add the 1s of the second number.
  $97+\textcolor{cc0000}{3}=100$
  Do you have a question?
  Write it here 👉
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.
1. $66+91$
  
  For this task you need the following basic knowledge: Written method of addition
  $\def\arraystretch{1.25} \begin{array}{l}\;\;\;\;\;\;\;6\;6\\\underline{+~~_1\;9\;1}\\\;\;\;\;1\;5\;7\end{array}$
  Do you have a question?
  Write it here 👉
2. For this task you need the following basic knowledge: Written method of addition
  $\def\arraystretch{1.25} \begin{array}{l}\;\;\;\;\;\;\;4\;\;\;2\\\underline{+~~_1\;7_1~\;8}\\\;\;\;\;1\;2\;\;\;0\end{array}$
  Do you have a question?
  Write it here 👉
3. For this task you need the following basic knowledge: Written method of addition
  $\def\arraystretch{1.25} \begin{array}{l}\;\;\;\;\;\;\;6\;3\\\underline{+~~_1\;8\;0}\\\;\;\;\;1\;4\;3\end{array}$
  Do you have a question?
  Write it here 👉