Lynne, Oupa Karel and Anton were getting things ready for Lynne's birthday party.

Anton and Lynne are going to bake a cake. Oupa Karel reads the recipe.

"Let's mix these ingredients in the big bowl," said Lynne.

Anton stirred the ingredients and made a big mess.

"The cake feels heavy now," said Oupa Karel.

"Your friends have arrived," said Oupa Karel.

Anton thought the first present would be heavy because it was big.

It was a pillow and it weighed very little.

Anton thought the next present would be light because it was small.

It was a painted rock and it weighed a lot.

The children said that 1 kilogram of rocks weighs the same as 1 kilogram of feathers.

Lynne's cake was burnt.

Lynne was very sad.

Auntie Mavis asked Anton to guess how much her present weighed.

"It weighs the same as the cake that burned," said Anton.

Everyone said, "happy birthday, Lynne."