Math : Grade 5 : Exercise 1E

1 Fill in the boxes with hindu - arabic numerals.

a. XL

X : 10

L : 50

XL implies 50-10 = 40

if its LX then its 50 + 10 = 60

so, XL = 40

b. X

X = 10

c. LXX

LXX = 50 + 10 + 10 = 70

so, LXX = 70

d. XXX

XXX = 10 + 10 + 10 = 30

so, XXX = 30

e. XC

C = 100

XC = 100 - 10 = 90

so, XC = 90

f. XX

XX = 10 + 10 = 20

g. LX

LX = 50 + 10 = 60

h. LXXX

LXXX = 50 + 10 + 10 + 10 = 80

i. C

C = 100

j. L

L = 50

2. Write the hinu arabic numerals.

a. XXIV

XXIV = 10 + 10 + 4 = 24

b. XC 

XC = 100-10 = 90

c. LVII

LVII = 50 + 7 = 7

d. XLIV

XLIV = (50-10) + 4 = 44

e. LXXV

LXXV = 50 + 10 + 10 + 5 = 75

f. LXXXII

LXXXII = 50 + 10 + 10 + 10 + 2 = 82

4. Compare using <,> or =

a. XC ________ XL

XC = 90 , XL = 40

so, XC > XL

b. XLIV ______ LXIV

XLIV = 44 , LXIV = 64

so, XLIV <  LXIV

c. XXVII _____ LX

XXVII = 27 , LX = 60

so, XXVII < LX

d. LVII  ____ C

LVII = 57 , C = 100

so, LVII < C

5. Give the answer in Roman numerals.

a. XXV + XL

XXV = 25 , XL = 40

XXV + XL = 65 = LXV

b. LXII + XII 

LXII = 62 , XII = 12

LXII + XII = 74 = LXXIV

c. LXX + XXX

LXX = 70 , XXX = 30

LXX + XXX = 100 = C

d. L - XXXIX

L=50 , XXXIX = 39

L - XXXIX = 11 = XI