Mental Math Class 5 Worksheet – Roman Numbers
Mental Math Class 5 Worksheet Chapter Number. Here in this page we have given total 25 Questions Set with Solution for Students.
(Q1) Write numbers for following Roman numbers.
(i) LXX
Solution:
We know, L à 50 and x = 10
Then L + X + X + X = 50 + 10 + 10 + 10
LXXX = 80
(Q2) CD
Solution:
We know, C à 100, D à 500 but C is behind D i.e. subtraction CD = 500 – 100
CD = 400
(Q3) XIX
Solution:
We know, x = 10, IX = 9
∴ XIX = 19
(Q4) DX
Solution:
We know, D à 500 and x = 10
DX = 500 + 10
DX = 510
(Q5) XXVII
Solution:
We know, x = 10, V = 5, I = 1
∴ XXVII = 10 + 10 + 5 + 2 = 27
From Q6 to Q10 find value of questions in numbers.
(Q6) XXII + XL
Solution:
We know x = 10, L = 50
∴ XXII = 10 + 10 + 2 = 22
XL = 50 – 10 = 40
∴ XXII + XL = 22 + 40 = 62
(Q7) CX – XXX
Solution:
We know, C à 100 and X = 10
CX = 100 + 10 = 110 and XXX = 30
CX – XXX = 110 – 30 = 80
(Q8) IX + XX
Solution:
We know, IX = 9 and XX = 20
IX + XX = 9 + 20 = 29
(Q9) LXX + V
Solution:
We know, L à 50, V = 5
LXX = 50 + 10 + 10 = 70 and V = 5
LXX + V = 70 + 5 = 75
(Q10) C + D + XX
Solution:
We know, C à 100, D = 500, X = 10
C + D + XX = 100 + 500 + 20
C + D + XX = 620
From Q11 to Q20 write given numbers in Roman numerals.
(Q11) 35
Solution:
35 = 10 + 10 + 10 + 5
But 10 = x and 5 = V
∴ 35 = XXXV
(Q12) 225
Solution:
225 = 100 + 100 + 10 + 10 + 5
= 100 = C and 10 = x also V = 5
∴ 225 = CCXXV
(Q13) 960
Solution:
We know, 960 = 900 + 60
900 = 1000 – 100 = CM
60 = LX
∴ 960 = CMLX
(Q14) 570
Solution:
We know, 570 = 500 + 50 + 10 + 10
But, D = 500, L = 50, X = 10
∴ 570 = DLXX
(Q15) 74
Solution:
We know, 74 = 50 + 10 + 10 + 4
50 = L, 10 = x & 4 = IV
∴ 74 = LXXIV
(Q16) 43
Solution:
We know, 43 = 40 + 3
40 = 50 – 10, 50 = L, 10 = X
∴ 40 = XL
Then 3 = III
∴ 43 = XLIII
(Q17) 1310
Solution:
We know, 1310 = 1000 + 300 + 10
1000 = M, 300 = CCC & x = 10
1310 = MCCCX
(Q18) 2000
Solution:
We know, 2000 = 1000 + 1000
But, 1000 = M
2000 = MM or 2000 = —
(Q19) 24
Solution:
We know, 24 = 10 + 10 + 4
x = 10 and IV = 4
∴ 24 = XXIV
(Q20) 730
Solution:
We know, 730 = 500 + 100 + 100 + 30
500 = D, 100 = C, 30 = XXX
∴ 730 = DCCXXX
(Q21) Find multiplication & then addition L×C+M
Solution:
We know,
L à 50, C à 100 and M = 1000
∴ L×C = 50×100 = 5000
L×C+M = 5000 + 1000 = 6000 or —
(Q22) Which roman numerals subtracted from ‘c’ to get LV?
Solution:
We know, C à 100 also L = 50 and V = 5
∴ LV = 50 + 5 = 55
We make equation
C – x = LV
∴ 100 – x = 55
x = 45 (XLV)
We have to subtract XLV to get value LV
(Q23) Find (20×4+50) in Roman numerals.
Solution:
Firstly we solve given equation
(20×4+50)
= 80 + 50 = 130
We write 130 = 100 + 30
We know, 100 = C and 30 = XXX
∴ 130 = CXXX
(Q24) Find XXXVI + XL in numbers.
Solution:
We first find numbers.
XXXVI = 10 + 10 + 10 + 5 + 1 = 36
XL = 50 – 10 = 40
XXXVI + XL = 36 + 40 = 76
∴ XXXVI + XL = 76
(Q25) Express the value [2000/20] in roman numerals.
Solution:
We first divide the given data.
2000/20 = 20
But, we know, 100 = C
∴ The answer for [2000/20] is 100 i.e. C