In the second numbers round, a couple of solutions for 877 are: 75 + 9 = 84 6 + 5 = 11 84 x 11 = 924 924 + 3 = 927' 927 - 50 = 877 50 x 9 = 450 450 + 75 = 525 525 x 5 = 2625 2625 + 6 = 2631 2631 / 3 = 877 This last might seem counter-intuitive, but it's based on the fact that 35 x 25 = 875. 525 / 3 = 175, which is 25 x 7, so getting up to 525 and then multiplying by 5 then dividing by 3 was the equivalent of multiplying 25 x 7 x 5 and then adding 2 (the 6).
In the second numbers round, a couple of solutions for 877 are:
75 + 9 = 84
6 + 5 = 11
84 x 11 = 924
924 + 3 = 927'
927 - 50 = 877
50 x 9 = 450
450 + 75 = 525
525 x 5 = 2625
2625 + 6 = 2631
2631 / 3 = 877
This last might seem counter-intuitive, but it's based on the fact that 35 x 25 = 875. 525 / 3 = 175, which is 25 x 7, so getting up to 525 and then multiplying by 5 then dividing by 3 was the equivalent of multiplying 25 x 7 x 5 and then adding 2 (the 6).
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I possibly know how she got to 878:
6+5=11,
75x11=825,
825+50=875,
9/3=3,
875+3=878.
582. 75:25=3*100=300-9=291*2=582
6*4=24 *2=48 +25=73 *6=438
10*5=50 +3=53 *8=424
10*5=50 -8=42 +100=142 *3=426 -2=424
75/25=3 *100=300 -9=291 *2=582
424. 5*10=50+3=53*8=424
877. 75+9=84. 6+5=11*84=924+3-50=877
438 2*6=12*4=48+25=73*6=438