It is: 300+10 = 310
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300+20+8 is 10 less than what number
1 cm = 10 mm 30 cm = (30 x 10) = 300 mm 484 is a greater number than 300, so 484 mm is longer than 300 mm, and is therefore more than 30 cm also, too, as well.
11
11 is 1 more than 10
10