65 * 40 = 2,600
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2400
625 ÷ 65 = 9 with remainder 40 OR 9.615 times.
65 minus 40 is 25. :)
40/65 = 0.615385.... = 61.54% (rounded)
65*39 = 65*(40-1) = 65*40 - 65*1 = 2600 - 65 = 2535 To calculate 65*40 in your head, you can try 6.5 is half of 13 ie 6.5*2 = 13 so 65*2 = 130 so 65*4 = 260 and so 65*40 = 2600