21/30 + 8/30 = 29/30
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four fifths is equal to eight tents, so three tenths plus eight tenths is eleven tenths, or one and one tenth
When adding 3 tenths and 4 tenths, you are essentially adding like terms. In this case, both numbers have the same unit (tenths), so you can simply add the numerical values together. Adding 3 tenths and 4 tenths gives you a total of 7 tenths.
Watch closely:7.4@above, yes, to elaborate, you are writing 7, and 40/100, which any fraction would go after the decimal point. so 7.40, you can also drop the 0
Question : How do you write two thousand seven hundred and four tenths in standard form ? Solution : We have 2700.4 = [(2700.4/1000) × 1000] = 2.7004 × 10³ (in standard form)
four tenths?