Shape size
If a pattern shows shapes increasing in size by one unit each time, and the third shape has 4 units, how many units does the fifth shape have?
Word Problem
A bridge is built across a river. One quarter of the bridge is over the left bank of the river and one third of the bridge is over the right bank. The river is 120 m wide. How long is the bridge?
Let’s break it down:
ReplyDeleteThe size increases by 1 unit each time, so this is an arithmetic sequence.
The third shape = 4 units
Since it increases by 1 unit per step, we can work backwards to find the earlier shapes:
Third shape = 4
Second shape = 4 - 1 = 3
First shape = 3 - 1 = 2
Now continue the pattern forward:
Fourth shape = 4 + 1 = 5
Fifth shape = 5 + 1 = 6