Alex is working out a calculation. He rounds both numbers in the calculation to the nearest whole number. The answer is 25 Which of these calculations is he working out?
16.36 + 8.36 ,
16.36 + 8.45,
16.36 + 8.79,
16.36 + 9.57
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Answer:
16.36 + 8.79
Step-by-step explanation:
If 0,1,2,3,4 are in the first decimal point round down, else round up.
a. 16.36 + 8.36
16.36 - 16 (First decimal number is 3)
8.36 - 8 (First decimal number is 3)
16 + 8 = 24
b. 16.36 + 8.45
16.36 - 16 (First decimal number is 3)
8.45 - 8 (First decimal number is 4)
16 + 8 = 24
c. 16.36 + 8.79
16.36 - 16 (First decimal number is 3)
8.79 - 9 (First decimal number is 7)
16 + 9 = 25.
d. 16.36 + 9.57
16.36 - 16 (First decimal number is 3)
9.57 - 10 (First decimal number is 5)
16 + 9 = 25.
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