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To solve this problem, we will follow these steps:
Following these steps, can be rewritten and solved as .
Therefore, the equivalent expression and solution to this problem is .
Add fifty units to the number 31.
What is the resulting number?
We choose 1+7 because adding 1 to 19 gives us the friendly number 20! It's much easier to add 7 to 20 than to work with 19 directly.
That's fine if you can do it! But breaking into friendly numbers like 20 makes addition faster and reduces mistakes, especially with larger numbers.
Look for the opportunity to make tens! Since 19 is one away from 20, we break the 8 to get that missing 1, leaving 7 to add to our friendly 20.
Yes! This make-a-ten strategy works great for problems like 28+5 (break into 28+2+3) or 47+6 (break into 47+3+3). Always look for ways to reach the next ten!
Adding to multiples of 10 like 20, 30, 40 is easier because you just change the ones digit. feels more natural than crossing over from 19 to the twenties.
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