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The plural of 40 is 40s (forties), as in the man was in his 40s; the Second World War took place in the first half of the 40s.
8.525
1 rounded to the nearest 40s is zero.
100m/40s or 2.5 metres per second.
20s, 30s, 40s, 50s, 60s, 70s, 80s.Seven decades.