Two ways of answering:
Nearest ten to 16 = 20, nearest ten to 13 = 10 so sum of neaest tens = 20 + 10 = 30
Alternative: 16 + 13 = 29. Nearest ten to 29 = 30.
In this case the two answers agree, but they need not.
eg 14 + 13.
Nearest at first step gives 10 + 10 = 20
Nearest at last step gives 14 + 13 = 27 which goes to 30.
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13
The sum of 18 and 15 is 33. 10+10=20 & 8+5=13. 20+13=33.
To the nearest integer, 13 To the nearest ten, 10
The answer to your question is 10 and three.10 + 3 = 13 (Sum)10 - 3 = 7 (Difference)I hope this helps.