Since the whole numbers are the same 12 = 12. Compare the decimal part from left to right.

Since 6 > 5, it shows that 12.65 > 12.56

2. Arrange the decimal in ascending order. 4.900, 4.180, 4.159

The whole numbers are all the same thus we just compare the decimal part.

Since 9 > 1 , the highest is 4.900. The other two numbers were 1 thus we compare the next digits which are 8 and 5 (8 > 5), so it follows that 4.180 > 4.159.

To arrange: 4.159, 4.180 and 4.900

3. Write the largest decimal number less than 1 having five different digits and 0 in the hundredths place.

To write this number we need to start with the highest digit followed by zero then the next largest digit downwards.

Thus the answer is : 0.90876

4. Kid spends 2.5 hours a day watching videos while his brother Old spends 30 minutes a day watching videos. If they both do this in a week then who spends more time watching videos, and by how much is the difference?

Kid spends 2.5 hrous a day, thus in one week 2.5 x 7 = 15 hours

Old spends 30 minutes = 0.5 hours a day, thus in one week 0.5 x 7 = 3.5 hours

The difference 15 -3.5 = 11.5 hours

Answer: In a week Kid spends more time watching videos and he uses 11.5 hours more, compared to his brother.