(4x5) + 30 = 50
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Expressed as a formula, this is equal to 30/x + 4.
3 8x3+6=30
The multiples of 4 that are less than 30 are 4, 8, 12, 16, 20, 24, 28. So the greatest multiple of 4 that is less than 30 is 28.
13 more than -4 = 9
30. 4 tens = 4 * 10 = 40 10 less than this = 40 - 10 = 30. We could also think of this as 10 (which is 1 ten) less than 4 tens must equal 3 tens (30).