520
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52 tens = 52 x 10 = 520
1 year = 12 months = 52 weeks roughly (52/12) x 10 = 43.333... = about 43 weeks
* Multiply by 10 (by addind a zero to the right of the number), * then double: Example - multiply 52 by 20: 52 x 10 = 520 double 520 = 1040
67.2
1800 200 = 23 x 52 300 = 22 x 3 x 52 450 = 2 x 32 x 52 600 = 23 x 3 x 52 lcm = 23 x 32 x 52 = 1800