MATH 140 In Class Exercise Name_____________________________________

1. Use Scratch Addition to find the following sums:

a) 567 b) 232₅

487 441₅

876 432₅

529 334₅

643 + 213₅

813

995

+ 847

2. Using parentheses and the four operations:

make each of the following equations true.

5 = 6 6 6 6

8 = 6 6 6 6

13 = 6 6 6 6

42 = 6 6 6 6

48 = 6 6 6 6

66 = 6 6 6 6

108 = 6 6 6 6

180 = 6 6 6 6