Mathematics
Grade-4-
Easy
Question
Lin creates a pattern using the rule “each layer has 4-blocks”.
The number of cubes in the 25th shape in Lin’s pattern is
- 120
- 160
- 200
- 100
Hint:
We are given a pattern of blocks of number of cubes made by Lin. The rule used to make pattern is “Each layer has four blocks”. There are three shapes. We have to find the number of cubes used to make the 25th shape.
The correct answer is: 100
We are given a pattern with number of cubes. The rule used to make the pattern is “Each layer has four blocks”.
One layer is added every time. With each layer, 4 blocks are added.
The number of cubes in the first shape is 4.
The number of cubes in the second shape is (2 × 4) = 8
The number of cubes in the third shape is (3 × 4) = 12
So, the number of cubes in the 25th shape will be 25 × 4 = 100
We have to be careful about the order of pattern.
