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Image from CHARMOUTH FOSSILS LTD charmouthfossils.co.uk/

Fossil Hunters. Image from http://www.jeroenb.nl/webshop/images/categories/fossil-fish-1.jpg. Image from CHARMOUTH FOSSILS LTD www.charmouthfossils.co.uk/. Image from www.earthhistory.org.uk/wp-content/crayfish.jpg.

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Image from CHARMOUTH FOSSILS LTD charmouthfossils.co.uk/

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  1. Fossil Hunters • Image from http://www.jeroenb.nl/webshop/images/categories/fossil-fish-1.jpg • Image from CHARMOUTH FOSSILS LTD • www.charmouthfossils.co.uk/ • Image from www.earthhistory.org.uk/wp-content/crayfish.jpg Fossil sea star (Eoactisstachi), Late Silurian (c. 420 million years old), Melbourne, VictoriaPhotographer: Rodney Start. Source: Museum Victoria

  2. Adam found 235 fossils. Amelia found 343 fossils. How many more fossils did Amelia find?

  3. Adam found 235 fossils. Amelia found 343 fossils. How many more fossils did Amelia find? Write the question as a statement leaving a blank for the answer. Amelia found ____ more fossils than Adam.

  4. Adam found 235 fossils. Amelia found 343 fossils. How many more fossils did Amelia find? Can we use an open number line to find the difference between these two numbers?

  5. Adam found 235 fossils. Amelia found 343 fossils. How many more fossils did Amelia find? Draw your number line and place Adam’s 235 fossils and Amelia’s 343 fossils on each end. 235 343 Amelia’s Fossils Adam’s Fossils

  6. Now let’s try to jump back from 343 to 235. 235 343 Amelia’s Fossils Adam’s Fossils

  7. First we will subtract 3 to get to a friendly ten. -3 235 340 343 Amelia’s Fossils Adam’s Fossils

  8. How many do we subtract to get to 300? -3 -40 235 300 340 343 Amelia’s Fossils Adam’s Fossils

  9. We are down to 300. We don’t want to subtract too many. What is the friendly ten that is greater than 235? -3 -40 ? 235 300 340 343 Adam’s Fossils Amelia’s Fossils

  10. You are right. It is 240! What do we subtract from 300 to get to 240? -3 -40 240 235 300 340 343 Adam’s Fossils Amelia’s Fossils

  11. If we subtract 60 from 300 that will get us to 240. We are getting close to 235. How many more do we need to take away? -3 -40 -60 240 235 300 340 343 Adam’s Fossils Amelia’s Fossils

  12. Wow! You are right! If we subtract 5 from 240 that gets us to 235. -3 -40 -5 -60 240 235 300 340 343 Adam’s Fossils Amelia’s Fossils

  13. We were able to subtract 3, 40, 60, and 5 to get from 343 to 235. What can we do to find out how many we subtracted? -3 -40 -5 -60 240 235 300 340 343 Adam’s Fossils Amelia’s Fossils

  14. Add the numbers we subtracted to find the total number we subtracted. 5 60 40 +3 108 Answer Fossils -3 -40 -5 -60 240 235 300 340 343 Adam’s Fossils Amelia’s Fossils

  15. Adam found 235 fossils. Amelia found 343 fossils. How many more fossils did Amelia find? We were able to jump back from 343 to 235 to get the difference between the two numbers. The difference is 108. -3 -40 -5 -60 240 235 300 340 343 Adam’s Fossils Amelia’s Fossils

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