Exercises: addition of natural numbers

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:
$35 + 18 = 53$

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