25 + 78 = 103
78 - without the aid of a calculator !
78 + 25 = 103
53 + 25 = 78
4+78=82-7=75
167 ■
546 + 432 - 78 + 345 = 555
36 + 78 + 198 + 475 + 620 = 1,407
That equals 199
No.567 + 78 - 56 = 589
144
Anton Heinrich Springer?
5 plus 25 equals 60. Need to solve for 5 plus 25 equals ?: 2 plus 10 equals 24 is equivalent to 2 × (1 plus 5) equals 2 × (12); and 3 plus 15 equals 36 is equivalent to 3 ×(1 plus 5) equals 3 × (12); thus 5 plus 25 equals ? is equivalent to 5 × (1 plus 5) equals 5 × (12); thus ? = 5 × 12 = 60.