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First, solve the right-hand exercise since adding the numbers together will give us a round number:
Now we have an easier exercise to solve:
23
\( 94+12+6= \)
Adding first gives you a round number! Then is much easier to calculate mentally than adding each 5 separately.
Yes! Addition is commutative, meaning the order doesn't change the result. But grouping strategically makes calculations faster and less error-prone.
Look for pairs that make 10 first (like 7+3, 6+4, 5+5). Then look for pairs that make other round numbers like 20 or 100. This strategy works for any length of addition!
Try adding the numbers in a different order. If you get the same answer, you're likely correct. You can also add left to right: .
For simple problems like this, mental math with grouping is often faster! Plus, it builds your number sense and helps you spot patterns in more complex problems.
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