Sheet # 35 Critical Thinking

Name: _____________________ Date_____________

Here are the stairs with blocks. The first staircase has one block, the second staircase has three blocks, the third staircase has six blocks. How many blocks do you need to build a staircase with seven steps? Can you figure out without building the staircase? Is there a number pattern for building the staircases?

Answers for sheet # 35

Pattern: 1, 3, 6, 7

1 step: 1 block
2 steps: 3 blocks
3 steps: 6 blocks
4 steps: 10 blocks
5 steps: 15 blocks
6 steps: 21 blocks
7 steps: 28 blocks








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