Planning and Activities
Put a potato in one side of a bucket balance and a pebble in the other side. Explain that the heavier object makes the balance go down on that side. Let children ‘be a balance’, like a see-saw, with arms outstretched. Pass round 100g weights. Children suggest things which are lighter and things which are heavier.
Group Activities: T with Y1
Y1 -- Compare objects to the weight of a book, finding objects heavier and lighter. Some children will order the objects from lightest to heaviest.
Y2 -- Compare everyday objects with 100g and 1kg weights.
Put an apple on one side of a balance scale, then put marbles on the other until the scale balances. Count the marbles. Draw a pictogram. Repeat with other objects.
Further Teaching with Y2
Explain the need for standard measures. Show 1kg, 1g and 100g weights. Weigh a shoe in 100g steps.
Group Activities: T with Y2
Use the ‘Ten to the kilo’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
Y1 -- Use bricks to estimate and weigh different pieces of fruit/vegetables.
Y2 -- Weigh items, such as cooking ingredients, to the nearest 100g.