Exercises: addition of natural numbers

Count the following single-digit numbers together.

$2+5$

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

For this task you need the following basic knowledge: Addition
$4+7$
$= 11$
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$8+9$

For this task you need the following basic knowledge: Addition
$8+9$
$=17$
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$5+7$

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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