Page 61 - steps 3b.pdf
P. 61
RM67
Weight 3b:16
Add and take-away weighing An activity for 2 or 3 children
You need: balance-scales; 109, 20 g, 50 g, 100 9 and 200 9 weights;
scoop; tub containing 250 9 of lentils or grain; 20 small cards labelled
109, 20 g, 30 g ... 200 g.
o Shuffle the cards and place them face down in a pile.
Then take turns to turn over the top card.
o First player
Look at the weight written on your card. Use a calculator if
Choose weights which add up to this amount. you get stuck adding
Put them on the balance-scales. or subtracting
Now balance the scales with the lentils.
Do the rest of you agree?
o Next player
Turn over the next card.
Add or take away weights and lentils until the scales
balance with the weight written on your card
Write down the old weight and the new weight.
Can you work out the difference?
/'1/ choose four
twenty gram weights.
o The next player continues until the cards are used up.
© 1993 Collins Educational (an imprint of HarperCollinsPublishers) STEPS 3b Measuring weights in multiples of 10g up to 200g.
