Jenson saved $4 in the first week and increased his savings by $6 each week. How much would he have saved at the end of 9 weeks?
Make a list: 4, 10, 16, 22, 28, 34, 40, 46, 52
Using rainbow method: 4 + 52 = 5610 + 46 = 5616 + 40 = 5622 + 34 = 56Sum of each pair = 56Number of pairs: 4, left: 28 Sum of all pairs = [56 x 4] + 28 = 224 + 28 = $252 Answer(s): $252