Colour 1 3 (one-third) of the picture.

We need to colour one-third of the picture. A one-third is one of three equal parts of something. 3 one-third makes one whole. The given diagram was divided into 3 equal parts and each part of that diagram is called as one-third. So, we colour only 1 one-third. Hence, the required answer is shown above.

Colour 1 4 (quarter) of the picture.

We need to colour quarter of the picture. A quarter is one of four equal parts of something. 4 quarters make one whole. The circle was divided into 4 equal parts and each part of the circle is called a quarter. So, we colour only one quarter. Hence, the required answer is shown above.

Colour 1 3 (one-third) of the picture.

We need to colour one-third of the picture. A one-third is one of three equal parts of something. 3 one-third make one whole. The given diagram was divided into 3 equal parts and each part of that diagram is called as one-third. So, we colour only 1 one- third. Hence, the required answer is shown above.

Colour 1 2 (half) of the picture.

We need to colour half of the picture. 2 halves make one whole. As we can see the circle is divided into two equal parts. Each part of the circle is called a half. So, we colour only one half. Now, Hence, the required answer is shown above.