Chapter 7 Decimals Worksheet - New Century Maths Page 35
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384 Decimal time
a Investigate the idea of decimal time. How would
you measure time in this system?
10
1
9
b Design a decimal time calendar.
2
8
c How would decimal time affect your birthday
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7
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and age?
5
d Do you think decimal time is possible? Explain.
Power plus
1 Code breaker
A long time ago, the warrior Wolf was trying to break a code that would open some
dungeon doors. He had to free the prisoners before midnight so that they would not be
turned into frogs by an evil spell. Each castle door was operated by a combination lock.
a Use the following clues to match the various combinations with the doors to the
different rooms in the castle.
Combinations
Rooms
8.262
Queen’s chamber
9.24
armoury
9.96
throne room
8.07
banquet hall
8.16
kitchen
8.79
dungeon
Clues
• Combination 9.24 opens a door to a room that deals with food.
• The combination to the armoury has a 6 in the hundredths place.
• The combinations of the throne room and the banquet hall add to 18.03.
• The Queen’s chamber has a combination that is bigger than 3.78 × 2.1 but smaller than
25.11 ÷ 3.1. (Hint: The doors in the dungeon and the throne room remained locked
when Wolf tried 9.96 and 8.262.)
• The kitchen combination is one of the three largest combination numbers.
b Invent another story that sets a code-breaking task involving decimals and ask your
classmates to solve it.
2 Calculate:
a 0.02 × 0.02
3
3
b (0.02)
c (1.1)
3
d
0.04
e
0.36
f
0.027
3 Decide where the decimal point should be so that the numbers in the ovals fit the clues.
a The product of the two numbers is 91.02.
246
37
The sum of the numbers is 28.3.
b The sum of the three numbers is 14.
57
6
23
The product of the three numbers is 78.66.
c The sum of the four numbers is 28.32.
72
51
The product of two of the numbers is 3.672.
18
45
The product of the other two is 81.
232
NEW CENTURY MATHS 7
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