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# Seesaws

### Purpose:

The purpose of this activity is to help your child to make and compare objects of different weights, and to use appropriate maths language to describe these.

### Link to NZ Curriculum:

Your child is learning to order and compare objects by weight and to count using whole numbers.

### What to do:

Have your child explore the play dough, making and talking about different shapes.

• Suggest your child uses the dough to make two different sized creatures, for example a big cat and a small cat. Have them suggest which one is heavier.
• Create a seesaw by resting the ruler on the eraser. Have your child predict what will happen if a cat sits on one end of the seesaw, and then one on each end. Try and see. Have your child explain what happens and why using comparative language, lighter, heavier.
• Have them create more animals of different sizes. Have them compare the weights of these on the seesaw, and then see if they can order their animals from the lightest to the heaviest, using the language of weight as they do so.
• Encourage your child to use the logic of indirect comparison, so, if animal A is heavier that animal B, and animal B is heavier than animal C, then we know, without comparing A and C on the seesaw, that A will be heavier than C.
• Challenge your child to make two animals that weigh the same, recognizing that the seesaw should balance. Encourage them to see that if they begin by making two play dough balls that weigh exactly the same amount, they can then shape these into animals that will also weigh the same.
This helps to develop an understanding of the conservation of mass – that is, the mass or weight remains the same even if we change the form.

NB. Mass and weight do not have exactly the same meaning, but in the early years at primary school the words tend to be used interchangeably.

### What to expect your child to do:

• Correctly use the specific language associated with weight (mass) instead of using ‘bigger or smaller’, as this is not necessarily specific to mass.
• Correctly order their animals from lightest to heaviest, describing their actions as they do so.
• Recognize that changing the shape of a ball of dough does not change its weight.

### Related Māori vocab:

 seesaw tīemiemi play dough poikere heavy taumaha heavier he taumaha ake light māmā lighter he māmā ake

### Download a file of this activity:

PDF (77KB) or Word (19KB)

### Download a file of this activity including questions to ask in Māori:

PDF (135KB) or Word (21KB)