Howard saved $4 in the first week and increased his savings by $5 each week. How much would he have saved at the end of 9 weeks?
Make a list: 4, 9, 14, 19, 24, 29, 34, 39, 44
Using rainbow method: 4 + 44 = 489 + 39 = 4814 + 34 = 4819 + 29 = 48Sum of each pair = 48Number of pairs: 4, left: 24 Sum of all pairs = [48 x 4] + 24 = 192 + 24 = $216 Answer(s): $216
