1-Step-by-step explanation:
Answer:
precipitation
Step-by-step explanation:
Answer:
Explanation is^{} in a file
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I don't quite understand the ten strategy, or what EXACTLY you're asking. But, what you can do is when you add a one digit number plus a nine, just change the nine to a ten and subtract one. It is very easy. So, 7+10 equals 17, subtract one and you get 16 which is 7+9. It is always one less than anything plus 10.