Ethan made patterns using squares and chopsticks and recorded the pattern in the table shown.
| Figure number |
Number of squares |
Number of chopsticks |
| 1 |
3 |
10 |
| 2 |
4 |
13 |
| 3 |
5 |
16 |
| 4 |
6 |
19 |
- How many squares are needed for Figure 28?
- How many chopsticks are needed for Figure 28?
- Which figure needs a total of 127 chopsticks?
(a)
Pattern for the number of squares
Figure 1: 1 + 2 = 3 squares
Figure 2: 2 + 2 = 4 squares
Figure 3: 3 + 2 = 5 squares
Figure 4: 4 + 2 = 6 squares
Formula:
Number of squares = Figure number + 2
Number of squares in Figure 28
= 28 + 2
= 30
(b) Pattern for the number for number of chopsticks Figure 1: (1 x 3) + 7 = 10 chopsticks Figure 2: (2 x 3) + 7 = 13 chopsticks Figure 3: (3 x 3) + 7 = 16 chopsticks Figure 4: (4 x 3) + 7 = 19 chopsticks Formula:Number of chopsticks = (Figure number x 3) + 7 Number of chopsticks in Figure 28 = (28 x 3) + 7= 84 + 7 = 91 (c)(Figure number x 3) + 7 = 127Figure number x 3 = 127 - 7 = 120
Figure number = 120 ÷ 3 = 40
Answer(s): (a) 30; (b) 91; (c) 40
