In both cases 3 students per computer
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the multiples of 5 are 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200 etc
70-45=25
45 x 6 = 270
45 x 89 = 4,005
The way that I remembered multiples of 9 is that whatever you're multiplying by you can put that finger down and the fingers left will be the answer... Such as.. You're multiplying 9 x 5. Well put your 5th finger down (thumb on left hand) and then you have 4 fingers on the left hand left and 5 on the right hand. Your answer is 45. 9 x 5 = 45. This process works with all multiples of 9.