Round off these numbers to the nearest tens 28, 32, 52, 41, 39, 48, 64, 59, 99, 215, 1453, 2936.
(a) 28 = 30
(b) 32 = 30
(c) 52 = 50
(d) 41 = 41
(e) 39 = 40
(f) 48 = 50
(g) 64 = 60
(h) 59 = 60
(i) 99 = 100
(j) 215 = 220
(k) 1453 = 1450
(l) 2936 = 2940
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