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Page 1: Two Ways to Keep Track

Two Ways to Keep Track

• Interval (measurement)counts the jumps

•Discretecounts the items that go away

4 5 6 7 8 9 10 11 12

“12”“11”“10”“so there are 9 left”

12 – 3

12 – 3

X X X

“11”“10”“9”

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n +

10

fact

s g

o h

ere

10 + n facts go here

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Level 4

Level 5