# CIE Mathematics Paper-1: Specimen Questions 28 - 30 of 175

## Question number: 28

### Write in Short

Mention order of rotational symmetry.

### Explanation

Here, The order of rotational symmetry is that an object has the number of times that it fits on to itself during a full rotation of 360 degrees.

• So, here given image will rotate and can fit in itself at means two times.
• So, order of symmetry of given image is 2.

## Question number: 29

### Write in Short

(a) Expand the bracket and simplify the expression

(b) Factorize .

### Explanation

Here,

(a) Expression is

(b) Factorization is the decomposition of an object into a product of other objects or factors which will give the original object after multiplication.

So,

## Question number: 30

### Write in Short

There are approximately 500000 grains of wheat in a 2 kilogram bag.

(a) Find mass of one grain in grams.

(b) Write answer in standard form.

### Explanation

Here,

(a) Here, 500000 grains of wheat in a 2 kilogram bag.

So, 500000 grains = 2000 grams

1 grain =? Grams

So,

(b) Standard form of .

So, for making standard form we need to shift decimal point from left to right three times.

So, it will be: .

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