39.5, 40.5 (to the nearest unit)
35 and 45 (to the nearest 10)
31 and 59 (to the nearest 20).
Rather than round up 5s, I "round ties to even". This is the recommended default under the IEEE 754 technical standard which has been adopted internationally.
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It can be rounded to 35670.1 because 0.06 is greater than 0.05
1/10
40
how many numbers round to 300
40