1. Mass
L Wright 2006

2. Today we will be learning to:
solve measurement problems
use words about mass and ways of measuring weight
measure using non-standard units
compare weights
estimate and measure.
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3. Mental Activity Imagine a spider is on number 4 of a hundred square.
Which number is below it?
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4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
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5. Imagine a spider is on number 19 of a hundred square.
Which number is below it?
Which number is above it?
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6. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
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7. Imagine a spider is on number 45 of a hundred square.
Which number is below it?
Which number is above it?
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8. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
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9. Imagine a spider is on number 99 of a hundred square.
Which number is above it?
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10. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
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11. Imagine a spider is on number 34 of a hundred square.
Which number is below it?
Which number is above it?
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12. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
100
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13. Main Activity Today we are going to be finding out about mass
which is how heavy things are.
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14. I will show you two parcels. Which is the heaviest?
How could we find out?
What if the parcels were in a different room or place?
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15. You will now be split into six groups.
Each group will be given a parcel.
How could you find out which is the heaviest parcel?
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16. Each group will be given a balance and some non-standard units.
Remember to measure using the same units.
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17. Which unit do you need most of? Why?
Which unit is the best or worst for measuring with?
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18. Which parcels were the heaviest? Did you find them all the same?
Each parcel weighed 1kg.
What does this term mean?
Where have you heard the term before?
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19. Group Work Work in the same groups.
Draw a table of classroom objects that are heavier or lighter than a kilogram.
heavier
lighter
1kg
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20. Plenary Look at the sheet showing a range of different scales.
What step is the scale going up in?
How did you work it out?
What does each division represent?
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21. Remember! Homework Work out what each division stands for.
Use what you know to work out what you don’t know.
Homework
Find three things at home which weight more than 1kg and three things which weigh less than 1kg.
L Wright 2006