Dewch i Feddwl Mathemateg (9 i 11 oed) Gwers 1 Cyfrif Cartwn
Lesson Plan
| Abstract |
| Look at some pictures of familiar cartoon characters. What do you notice about their hands? How might this affect the things they can and can’t do? Raise the issue of counting and how this might work. |
| Episode 1 |
| Intro Demonstrate the counting system as per Resource Sheet A. Allow the children to use their fingers only (no thumbs) to make numbers in pairs using both pairs of hands. Show them to the class and explain what number they are for the cartoon character and for humans. Reinforce children’s understanding of the new number system through repetition and looking at misconceptions. Which numbers can/can’t the cartoon characters make? How could we find this out? |
| Group Discussion Work in groups using copies of Resource Sheet B. Cut out and stick the hands, writing the cartoon number and the human number. How will we make sure we have all the possibilities? Encourage groups to develop a systematic system. |
| Sharing Which numbers can the cartoon characters make? Which numbers can’t the cartoon characters make? Why? If we know they cannot make eg 18, 19, 28, 29, which larger numbers will they not be able to make. Is it true that they cannot make these numbers or do they just represent them in a different way? |
| Episode 2 |
| You are on a visit to cartoon land and you have been asked to do some shopping. Intro You visit the Cartoon Shop and need to buy the objects seen on Resource Sheet C. What will you need to say to the shopkeeper to get the right amount of objects? What strategies will you use to help you work this out. Encourage the children to use their fingers (without thumbs) or draw pictures of cartoon hands. |
| Group Discussion Work in groups to label Resource Sheet C with cartoon and human numbers. |
| Sharing Share results and prove you are right by using cartoon hands. Do you think you would find it easy to do your shopping cartoon land? Why (not)? Are some numbers more difficult to make than others? Why? |
| Episode 3 |
| One of the cleverest people on cartoon land only has one right hand and no left hand. She has invented a new counting system. See if you can understand it. Intro Hold your right hand out, palm down and tuck the thumb away. The little finger is worth one, the second is worth two, the third is worth four and the index is worth eight. If you hold the little and the third fingers up you have 1 + 4 = 5. If you hold the index and fourth fingers up you have 2 + 8 = 10. Reinforce this by doing lots of examples with the children and allowing them to work in pairs to make their own numbers. What is the largest number that can be made with one hand? With two hands?  |
| Group Discussion Which numbers can/can’t be made using this number system? Work in groups to investigate. How will we make sure we have all the possibilities? Encourage groups to develop a systematic system. |
| Sharing Feedback on which numbers can/can’t be made using this number system? Why (not)? |
| Reflection |
| Compare the three number systems – which do they think is best and why? |
Teacher crib sheet for first cartoon number system:
|
Simpson |
Human |
|
|
1 2 3 4 5 6 7 |
1 2 3 4 5 6 7 |
|
|
10 11 12 13 14 15 16 17 |
8 9 10 11 12 13 14 15 |
+2 |
|
20 21 22 23 24 25 26 27 |
16 17 18 19 20 21 22 23 |
+4 |
|
30 31 32 33 34 35 36 37 |
24 25 26 27 28 29 30 31 |
+6 |
|
40 41 42 43 44 45 46 47 |
32 33 34 35 36 37 38 39 |
+8 |
|
50 |
40 |
+10 |