Punjab State Board PSEB 6th Class Maths Book Solutions Chapter 1 Knowing Our Numbers Ex 1.5 Textbook Exercise Questions and Answers.

## PSEB Solutions for Class 6 Maths Chapter 1 Knowing Our Numbers Ex 1.5

1. Which of the following are meaningless:

Question (a)

IC

Solution:

Since I can be subtracted only from V and X not from C

So IC is meaningless.

Question (b)

VD

Solution:

VD, since V cannot be subtracted

So VD is meaningless.

Question (c)

XCVII

Solution:

XCVII = XC + VII = 90 + 7 = 97

So XCVII is meaningful.

Question (d)

IVC

Solution:

Since IV cannot be subtracted from C.

So IVC is meaningless.

Question (e)

XM.

Solution:

Since X can be subtracted only from L and C not from M.

So XM is meaningless.

2. Write the following in Hindu Arabic Numerals:

Question (a)

XXV

Solution:

XXV = X + X + V

= 10 + 10 + 5 = 25

Question (b)

XLV

Solution:

XLV = XL + V = 40 + 5 = 45

Question (c)

LXXIX

Solution:

LXXIX = L + X + X + IX

= 50 + 10 + 10 + 9 = 79

Question (d)

XCIX

Solution:

XCIX = XC + IX = 90 + 9 = 99

Question (e)

CLXIX

Solution:

CLXIX = CL + X + IX = 40 + 10 + 9 = 59

Question (f)

DCLXII

Solution:

DCLXII = D + C + L + X + II

= 500 + 100 + 50 + 10 + 2 = 662

Question (g)

DLXIX

Solution:

DLXIX = D + L + X + IX

= 500 + 50 + 10 + 9

= 569

Question (h)

DCCLXVI

Solution:

DCCLXVI = D + CC + L + X + VI

= 500 + 200 + 50 + 10 + 6 = 766

Question (i)

CDXXXVIII

Solution:

CDXXXVIII = CD + XXX + VIII

= 400 + 30 + 8 = 438

Question (j)

MCCXLVI = M + CC + XL + VI

= 1000 + 200 + 40 + 6

= 1246

3. Express each of the following as Roman numerals:

Question (i)

(a) 29

(b) 63

(c) 94

(d) 99

(e) 156

(f) 293

(g) 472

(h) 638

(i) 1458

(j) 948

(k) 199

(l) 499

(m) 699

(n) 299

(o) 999

(p) 1000

Solution:

(a) 29 = 20 + 9 = XXIX

(b) 63 = 60 + 3 = LXIII

(c) 94 = 90 + 4 = XCIV

(d) 99 = 90 + 9 = XCIX

(e) 156 = 100 + 50 + 6 = CLVI

(f) 293 = 200 + 90 + 3 = CCXCffl

(g) 472 = 400 + 70 + 2 = CDLXXII

(h) 638 = 600 + 30 + 8 = DCXXXVIII

(i) 1458 = 1000 + 400 + 50 + 8 = MCDLVIII

(j) 948 = 900 + 40 + 8 = CMXLVIH

(k) 199 = 100 + 90 + 9 = CXCIX

(l) 499 = 400 + 90 + 9 = CDXCIX

(m) 699 = 600 + 90 + 9 = DCXCIX

(n) 299 = 200 + 90 + 9 = CCXCIX

(o) 999 = 900 + 90 + 9 = CMXCIX

(p) 1000 = M.