Emily uses sticks and coins to form figures that follow a pattern. The first four figures are shown.
- The table shows the number of sticks and coins Emily used to each figure. Complete the table for Figure 7 (i) and (ii). Give your answers in the following format. (Eg 1, 2)
- A figure in the pattern has a total of 106 coins. What is the figure number of that pattern?
- How many sticks are there in Figure 28?
(a)
Number of sticks:
Figure Number 1: 1 + 1 x 2 = 3
Figure Number 2: 1 + 2 x 2 = 5
Figure Number 3: 1 + 3 x 2 = 7
Figure Number 4: 1 + 4 x 2 = 9
Formula:
Number of sticks = 1 + Figure Number x 2
Number of coins:
Figure Number 1: 2 + 1 = 3
Figure Number 2: 2 + 2 = 4
Figure Number 3: 2 + 3 = 5
Figure Number 4: 2 + 4 = 6
Formula:
Number of coins = 2 + Figure Number
Number of sticks for Figure 7
= 1 + 7 x 2
= 15
Number of coins for Figure 7
= 2 + 7
= 9
(b)
2 + Figure Number = 106
Figure Number = 106 - 2
Figure Number = 104
Figure Number that has a total of 106 coins: 104
(c)
Number of sticks in Figure 28
= 1 + 28 x 2
= 1 + 56
= 57
Answer(s): (a) 15, 9 ; (b) 104; (c) 57