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Let us now learn about number pyramid, number grid and decoding in this chapter.
Number Pyramid
In a number pyramid, the number in each space is the sum of the two numbers
below it.
Start with a circle, which has two filled adjoining circles below it.
Here, blue circle is the sum of two green circles.
Therefore, blue circle is 2 + 1 = 3.
We can get the remaining numbers by following the same pattern.
9
Notes
5 4 In a number pyramid, you add
the numbers below to find the
number above.
3 2 2
2 1 1 1
Quest Critical Thinking
Help the boy reach the top of the pyramid by filling the missing spot.
5 6 9 17
Reasoning and Analysis 37

