MENTAL PYRAMIDS

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MENTAL PYRAMIDS
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MENTAL PYRAMIDS
In the following pyramids, the number in each
cell is obtained by adding the 2 numbers in the
cells beneath it.
For example
21
9
12
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MENTAL PYRAMIDS
For each pyramid, you are asked to determine the
contents of the cell marked with a ? without
working!
Example 1.
?
19
7
12
4
MENTAL PYRAMIDS
Example 2.
?
5x 6
2x 3
3x 3
5
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Example 3.
4
5
?
4
6
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Question 1.
?
7
MENTAL PYRAMIDS
Question 2.
?
8
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Question 3.
?
9
MENTAL PYRAMIDS
Question 4.
?
10
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Question 5.
?
11
MENTAL PYRAMIDS
Question 6.
?
12
MENTAL PYRAMIDS
Question 7.
?
13
MENTAL PYRAMIDS
Question 8.
?
14
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Question 9.
?
15
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Question 10.
?
16
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Question 11.
?
17
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Question 12.
?
18
MENTAL PYRAMIDS
Answer to question 1.
?
13
3
10
19
MENTAL PYRAMIDS
Answer to question 2.
?
34
16
18
20
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Answer to question 3.
?
x 11
x 1
10
21
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Answer to question 4.
?
x 16
8
x 8
22
MENTAL PYRAMIDS
Answer to question 5.
?
2x 8
x 6
x 2
23
MENTAL PYRAMIDS
Answer to question 6.
?
4x 8
2x 6
2x 2
24
MENTAL PYRAMIDS
Answer to question 7.
?
2x 20
x 10
x 10
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MENTAL PYRAMIDS
Answer to question 8.
?
2x 14
x 9
x 5
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MENTAL PYRAMIDS
Answer to question 9.
?
2x 13
x 6
x 7
27
MENTAL PYRAMIDS
Answer to question 10.
?
3x 9
2x 2
x 7
28
MENTAL PYRAMIDS
Answer to question 11.
8
3
?
2
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MENTAL PYRAMIDS
Answer to question 12.
x 3
x 3
?
3