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## Question

primary 5 | Maths
| Whole Numbers

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Question (c)

Fig 2 : 3 squares = 1 + 2

Fig 3 : 6 squares = 1 + 2 + 3

Fig 4 : 10 squares = 1 + 2 + 3 + 4

Fig 5 : 15 squares = 1 + 2 + 3 + 4 + 5

So for figure 100 ,

Number of squares = 1 + 2 + 3 + 4 + ....

+ 96 + 97 + 98 + 99 + 100

Notice that :

1 + 100 = 101

2 + 99 = 101

3 + 98 = 101

4 + 97 = 101

and so on.

Try to work it out yourself from here. Find out how many sets of 101s there are.

Then find the total to get your answer.

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