Page 58 - TB_5B
P. 58
b. What is the last digit of
the 20th product when 0.2
is multiplied twenty times?

0.2 0.2
0.2 0.2 0.04
0.2 0.2 0.2 0.008
0.2 0.2 0.2 0.2 0.0016
0.2 0.2 0.2 0.2 0.2 0.00032
0.2 0.2 0.2 0.2 0.2 0.2 0.000064

c. Discuss how you can find

the ones place digit of the
22nd product.

77
7 7 49
7 7 7 343
7 7 7 7 2401
7 7 7 7 7 16807
7 7 7 7 7 7 117649

21. Multiplying by Decimals 47
   53   54   55   56   57   58   59   60   61   62   63