Convert the following units and numbers: a) 1 million to lakhs, b) 60 lakh to millions, c) 1 lakh to thousands, d) 500 thousand to lakhs. Write the following numbers in Roman numerals: a) 49, b) 100,

One million is 1,000,000. One lakh is 100,000.

a) One million = $\boxed{\text{10}}$ lakh

Sixty lakh is $60 \times 100,000 = 6,000,000$. One million is 1,000,000.

b) Sixty lakh = $\boxed{\text{6}}$ million

One lakh is 100,000. One thousand is 1,000.

c) One lakh = $\boxed{\text{100}}$ thousand

5 hundred thousand is $5 \times 100,000 = 500,000$. One lakh is 100,000.

d) 5 hundred thousand = $\boxed{\text{5}}$ lakh

Question 4: Write in Roman numerals

$40 = XL$ (L - X)
$9 = IX$ (X - I)

a) $49 = \boxed{\text{XLIX}}$

b) $100 = \boxed{\text{C}}$

$90 = XC$ (C - X)

c) $90 = \boxed{\text{XC}}$

$50 = L$
$9 = IX$ (X - I)

d) $59 = \boxed{\text{LIX}}$