Difference between revisions of "Subtraction - With Changing"
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(New page: ==Subtraction - With Changing== === Age === 3-6 <br /> === Materials === <ol><li>Unlimited Golden Beads.</li><li>Large Number Cards.</li><li>At least 2 sets of Small Number Cards.</li><li>...) |
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− | + | === Age === | |
− | === Age | ||
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− | + | 3-6 <br> | |
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− | <br | ||
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− | + | === Materials === | |
− | === | ||
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− | + | #Unlimited Golden Beads. | |
− | + | #Large Number Cards. | |
− | + | #At least 2 sets of Small Number Cards. | |
+ | #At least 2 trays and unit pots fro carrying. | ||
+ | #An operational mat. | ||
+ | #A floor mat. | ||
+ | <br> | ||
− | [[Category:Mathematics]] | + | === Preparation === |
+ | |||
+ | <br> | ||
+ | |||
+ | === Presentation === | ||
+ | |||
+ | #This is a group activity. Directress invites the children to take the Large and Small Number Cards from the shelf and to lay out the cards on the floor mat. | ||
+ | #Meanwhile, Directress sets up the 'Bank' and lays out the operational mat on the table. | ||
+ | #The Directress sets a subtraction question, which involves changing, e.g. 3214-1246. | ||
+ | #Directress gives child a tray and asks her to fetch the large number cards and the corresponding beads for 3214. | ||
+ | #Child A does that and places the beads on the operational mat with the cards beside it. | ||
+ | #The Directress then asks Child B to take away the quantity, 1246. | ||
+ | #The child will realize that he does not have enough units to take away when he tries to take away 6 units from the 4 units on the mat. | ||
+ | #Then he will be told that he could change one of the Ten Bead Bars on the mat for 10 Golden Beads at the bank. | ||
+ | #The 10 Golden Beads exchanged are placed together with the rest on the mat. | ||
+ | #The child then takes away 6 units. | ||
+ | #The child then tries to take away 4 tens and he will realize that there is none for him to take away. | ||
+ | #So, he exchange 1 One Hundred Square for 10 Ten Bead Bars. | ||
+ | #He then takes away 4 tens from the Ten Bead Bars on the mat. | ||
+ | #The child goes on to try taking away two hundreds from the one hundred left on the mat. He finds that he can't and so he exchanges 1 Thousand Cube for 10 Hundred Squares. | ||
+ | #From the Hundred Squares on the mat, the child takes away 2 hundred. | ||
+ | #Finally, the child takes 1 thousand from the 2 thousand left on the mat. | ||
+ | #The total 1246 taken away are placed on the tray and the corresponding small number cards are also fetched and placed on tray. | ||
+ | #Child A then starts to count the number of beads left on the mat. | ||
+ | #He brings the beads down to the bottom of the mat as he counts them as in previous exercises and find the total to be 1968. | ||
+ | #The corresponding small number cards are fetched and placed beside the beads. | ||
+ | |||
+ | <br> | ||
+ | |||
+ | === Control Of Error === | ||
+ | |||
+ | Directress guided. <br> | ||
+ | |||
+ | === Points Of Interest === | ||
+ | |||
+ | <br> | ||
+ | |||
+ | === Purpose === | ||
+ | |||
+ | *Show the children how to 'change' when doing subtraction. | ||
+ | |||
+ | <br> | ||
+ | |||
+ | === Variation === | ||
+ | |||
+ | <br> | ||
+ | |||
+ | === Handouts/Attachment === | ||
+ | |||
+ | <br> | ||
+ | |||
+ | [[Category:Mathematics]] [[Category:Mathematics_3-6]] |
Latest revision as of 04:50, 15 October 2009
Contents
Age
3-6
Materials
- Unlimited Golden Beads.
- Large Number Cards.
- At least 2 sets of Small Number Cards.
- At least 2 trays and unit pots fro carrying.
- An operational mat.
- A floor mat.
Preparation
Presentation
- This is a group activity. Directress invites the children to take the Large and Small Number Cards from the shelf and to lay out the cards on the floor mat.
- Meanwhile, Directress sets up the 'Bank' and lays out the operational mat on the table.
- The Directress sets a subtraction question, which involves changing, e.g. 3214-1246.
- Directress gives child a tray and asks her to fetch the large number cards and the corresponding beads for 3214.
- Child A does that and places the beads on the operational mat with the cards beside it.
- The Directress then asks Child B to take away the quantity, 1246.
- The child will realize that he does not have enough units to take away when he tries to take away 6 units from the 4 units on the mat.
- Then he will be told that he could change one of the Ten Bead Bars on the mat for 10 Golden Beads at the bank.
- The 10 Golden Beads exchanged are placed together with the rest on the mat.
- The child then takes away 6 units.
- The child then tries to take away 4 tens and he will realize that there is none for him to take away.
- So, he exchange 1 One Hundred Square for 10 Ten Bead Bars.
- He then takes away 4 tens from the Ten Bead Bars on the mat.
- The child goes on to try taking away two hundreds from the one hundred left on the mat. He finds that he can't and so he exchanges 1 Thousand Cube for 10 Hundred Squares.
- From the Hundred Squares on the mat, the child takes away 2 hundred.
- Finally, the child takes 1 thousand from the 2 thousand left on the mat.
- The total 1246 taken away are placed on the tray and the corresponding small number cards are also fetched and placed on tray.
- Child A then starts to count the number of beads left on the mat.
- He brings the beads down to the bottom of the mat as he counts them as in previous exercises and find the total to be 1968.
- The corresponding small number cards are fetched and placed beside the beads.
Control Of Error
Directress guided.
Points Of Interest
Purpose
- Show the children how to 'change' when doing subtraction.
Variation
Handouts/Attachment