910
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900
I think you mean HOW many tens make 900, so the answer is 90
300 plus 900 equals 1200. This is because addition is a basic arithmetic operation where two or more numbers are combined to find a total sum. In this case, adding 300 and 900 results in a sum of 1200.
900
Convert to the same units then the addition can be done: 1 mm = 1/1000 m → 2.2 m + 900 mm = 2.2 m + 900 × 1/1000 m = 2.2 m + 0.9 m = 3.1 m