Caden saved $6 in the first week and increased his savings by $4 each week. How much would he have saved at the end of 9 weeks?
Make a list: 6, 10, 14, 18, 22, 26, 30, 34, 38
Using rainbow method: 6 + 38 = 4410 + 34 = 4414 + 30 = 4418 + 26 = 44Sum of each pair = 44Number of pairs: 4, left: 22 Sum of all pairs = [44 x 4] + 22 = 176 + 22 = $198 Answer(s): $198