Practice and Review

9 __ 9 = ___ 9 + 9 = 9 − 9 = 9 × 9 = 9 ÷ 9 = 18 81 1

12 __ 4 = ___ 12 + 4 = 12 − 4 = 12 × 4 = 12 ÷ 4 = 16 8 48 3

20 __ 10 = ___ 20 + 10 = 20 − 10 = 20 × 10 = 20 ÷ 10 = 30 10 200 2

XXIX 29 LI 51 DCCXLVII 747

Arabic Numerals 1 2 3 4 5 6 7 8 9

XII I XI X II IX III VIII IV VII V VI

I = V = X = L = C = 1 5 10 50 100

Roman Numeral Rules 1. The symbol for 1, 10, or 100 should be used no more than 3 times in a row. VIII = 8 because 5 + 3 = 8 VIIII

Roman Numeral Rules 2. When a lesser symbol (I, X, or C) comes before a greater symbol, the lesser symbol is subtracted from the greater symbol. IX = 9 because 10 − 1 = 9

Roman Numeral Rules 3. When a lesser symbol comes after a greater symbol, the lesser symbol is added to the greater symbol. VI = 6 because 5 + 1 = 6

1 I 2 II 3 III 4 IV 5 V IIII 6 VI 7 VII 8 VIII 9 IX 10 X

Standard form Expanded form Roman numeral 11 10 + 1 XI 15 10 + 5 XV 19 10 + 9 XIX

Standard form Expanded form Roman numeral 15 10 + 5 XV 19 10 + 9 XIX 11 10 + 1 XI 15 10 + 5 XV 19 10 + 9 XIX 34 30 + 4 XXXIV

Standard form Expanded form Roman numeral 34 30 + 4 XXXIV 15 10 + 5 XV 19 10 + 9 XIX 57 50 + 7 LVII

IV XIV XXIV XXXIV XLIV LIV LXIV LXXIV LXXXIV XCIV 4 14 24 34 44 54 64 74 84 94 IX XIX XXIX XXXIX XLIX LIX LXIX LXXIX LXXXIX XCIX 9 19 29 39 49 59 69 79 89 99 40 XL XC 90

1 47 40 + 7 XLVII Standard form 38 64 82 14 29 47 Expanded form Roman numeral 40 + 7 XLVII

1 29 20 + 9 XXIX Standard form 38 64 82 14 29 47 Expanded form Roman numeral 20 + 9 40 + 7 XLVII XXIX

1 14 10 + 4 XIV Standard form 38 64 82 14 29 47 Expanded form Roman numeral 10 + 4 40 + 7 XLVII 20 + 9 XXIX XIV

1 82 80 + 2 LXXXII Standard form 38 64 82 14 29 47 Expanded form Roman numeral 80 + 2 40 + 7 XLVII 20 + 9 XXIX 10 + 4 XIV LXXXII

1 64 60 + 4 LXIV Standard form 38 64 82 14 29 47 Expanded form Roman numeral 60 + 4 40 + 7 XLVII 20 + 9 XXIX 10 + 4 XIV 80 + 2 LXXXII LXIV

1 38 30 + 8 XXXVIII Standard form 38 64 82 14 29 47 Expanded form Roman numeral 30 + 8 40 + 7 XLVII 20 + 9 XXIX 10 + 4 XIV 80 + 2 LXXXII 60 + 4 LXIV XXXVIII

Write in Roman numerals the score for Super Bowl XLIII. XXVII–XXIII Write in Roman numerals the difference in the score for Super Bowl XX. XXXVI 2 3

Write in standard form the Super Bowl number for 2009. 4 Write in standard form the Super Bowl number for 2009. 43

Write the Roman numerals for the San Francisco team’s name. List in standard form the Super Bowl numbers that the Pittsburgh Steelers won. 9, 10, 13, 14, 40, 43 Write the Roman numerals for the San Francisco team’s name. 5 6 XLIX

How many teams won back-to-back years? 5 teams Which team won the most recent Super Bowl listed? Pittsburgh Steelers 7 8

Pittsburgh Steelers; 34; XXXIV Which team has the most number of years between the first time it won a Super Bowl and the last time it won? Write that number in standard form and in Roman numerals. Pittsburgh Steelers; 34; XXXIV 9