Exercises: addition of natural numbers

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
$5 + 7 = 12$
$\circ \circ \circ \circ \circ + \circ \circ \circ \circ \circ \circ \circ$ $= \circ \circ \circ \circ \circ \circ \circ \circ \circ \circ \circ \circ$

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