Add 0.4 and 0.75. What is the sum?

Add 0.4 and 0.75. What is the sum?

• A. 0.95
• B. 1.25
• C. 1.15
• D. 1.35

Answer: (C)

Add decimals by lining up the decimal points and padding with zeros so each number has the same number of digits after the decimal. Here, write 0.4 as 0.40 to have two decimals. Then add 0.40 and 0.75 from right to left: hundredths place = 0 + 5 = 5; tenths place = 4 + 7 = 11. Since 11 tenths is 1 full unit plus 1 tenth, carry 1 to the ones place. The ones place becomes 1, the tenths place is 1, and the hundredths place is 5, giving 1.15. The sum is 1.15.

Add decimals by lining up the decimal points and padding with zeros so each number has the same number of digits after the decimal. Here, write 0.4 as 0.40 to have two decimals. Then add 0.40 and 0.75 from right to left: hundredths place = 0 + 5 = 5; tenths place = 4 + 7 = 11. Since 11 tenths is 1 full unit plus 1 tenth, carry 1 to the ones place. The ones place becomes 1, the tenths place is 1, and the hundredths place is 5, giving 1.15. The sum is 1.15.