Roman Numerals Learning objective: To learn how to count using Roman numerals.

The Romans did not have separate characters for numbers as we do today. Instead they used letters to symbolise different numbers.

What were the Roman numerals? 1 = I9 = IX60 = LX 2 = II10 = X70 = LXX 3 = III11 = XI80 = LXXX 4 = IV12 = XII90 = XC 5 = V20 = XX100 = C 6 = VI30 = XXX500 = D 7 = VII40 = XL1,000 = M 8 = VIII50 = L (the Romans did not have a character for ‘zero’)

Write out the following numbers in Roman numerals: 21 = 29 = 19 = 6 = 45 =

Write out the following numbers in Roman numerals: 21 = XXI 29 = 19 = 6 = 45 =

Write out the following numbers in Roman numerals: 21 = XXI 29 = XXIX 19 = 6 = 45 =

Write out the following numbers in Roman numerals: 21 = XXI 29 = XXIX 19 = XIX 6 = 45 =

Write out the following numbers in Roman numerals: 21 = XXI 29 = XXIX 19 = XIX 6 = VI 45 =

Write out the following numbers in Roman numerals: 21 = XXI 29 = XXIX 19 = XIX 6 = VI 45 = XLV

What are these numbers? XXIII = CL = CI = LVII = LXVI =

What are these numbers? XXIII = 23 CL = CI = LVII = LXVI =

What are these numbers? XXIII = 23 CL = 150 CI = LVII = LXVI =

What are these numbers? XXIII = 23 CL = 150 CI = 101 LVII = LXVI =

What are these numbers? XXIII = 23 CL = 150 CI = 101 LVII = 57 LXVI =

What are these numbers? XXIII = 23 CL = 150 CI = 101 LVII = 57 LXVI = 66

Change the Roman numerals below to our numbers X VIII XIII D LVII XCI LXV XXXIII XLV LXXXVI

Now change the following to Roman numerals

Now do these Roman sums: 1.I + II =8.XX + VIII = 2.V + V =9.IX + IX = 3.V + IV = 4.X – IV = 10.XXIII + IX = 11.L + IV = 5.X + V =12.CI – XI = 6.IV + VIII =13. L – II = 7.X + XII =14. LXXII – XIV =

Now answer this question: Why do you think we no longer use Roman numerals today?