1. Babylonian Maths Numbers in base 60

2. What do you think these five numbers are?

3. 20

4. What do you think these five numbers are? 20 40

5. What do you think these five numbers are? 20 53 40

6. What do you think these five numbers are? 20 28 53 40

7. What do you think these five numbers are? 20 4928 53 40

8. In base 60 … Any number between 1 and 60 corresponds to the units in our numbers. Getting to 60 in base 60 is like getting to 10 in base 10. We dont need a new symbol when we get to 10, and the Babylonians didnt need a new symbol for 60.

9. What do you think these three numbers are? 60 + 1060 + 20120 + 10 = 70= 80= 130

10. What do you think these two numbers are? 2 x 60 + 133 x 60 + 28 = 133= 208

11. Writing numbers in base 60 You dont have to write base 60 numbers in cuneiform symbols. Look at these base 60 numbers – can you work out what they mean? Can you change these base 10 numbers into base 60? Base 600 181 393 0611 20 Base 101860 + 39 = 99180 + 6 = 186660 + 20 = 680 Base 102969149299 Base 60291 092 294 59

12. Zero The Babylonians didnt have a separate symbol for 0. This number would have meant 3600 + 1 = 3601 The zero lots of 60 would have just been a gap. Is this a good way of showing a zero, do you think?