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%
responses
2001 ('97) |
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|
y4
|
y8
|
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| Questions/instructions: Check the adjustment of the balance before starting this task. Place the balance, lump of plasticine & box of raisins in front of the student. |
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| 1.
I want you to use the balance to make a lump of plasticine which is as
heavy as this box of raisins. If student just changes the shape of the plasticine: Prompt: You don’t have to use all of the plasticine. If student doesn’t use the balance: Prompt: Remember you can use the balance. |
successful
|
78
(75)
|
92
(93)
|
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|
almost
successful
|
13
(14)
|
6
(2)
|
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| 2.
How do you know that the lump of plasticine and the box of raisins are
the same weight? |
clear
and correct explanation
|
29
(18)
|
48
(46)
|
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|
fuzzy
explanation, but on right track
|
45
(46)
|
45
(40)
|
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| Remove
excess plasticine and give the student the lump which they have made. 3. Now use this lump to make two pieces that each weigh the same amount. If halved visually without being checked on the balance, ask: Prompt: How do you know that each lump weighs the same amount? Prompt: Can you think of a way of checking that out to see if they are the same? |
successful
|
78
(81)
|
93
(97)
|
|||||||||||
|
almost
successful
|
17
(13)
|
7
(2)
|
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| Place
the two plasticine lumps in front of the student. 4. This time I want you to try to make a lump that is one and a half times as heavy as one of these lumps. Prompt: How do you know that one lump is one and a half times as heavy as the other? Prompt: Can you think of a way of checking that? |
successful
|
5 (4)
|
12
(19)
|
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|
almost
successful
|
5
(2)
|
9
(7)
|
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|
Total
score:
|
5–6
|
8
(5)
|
20
(25)
|
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|
4
|
62
(65)
|
68
(67)
|
||||||||||||
|
3
|
15
(11)
|
9
(2)
|
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|
0–2
|
15
(19)
|
3
(6)
|
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|
Commentary: |
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