# Worksheet on Number System

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**Worksheet on Number system**

**1) How will the number 3,53,552 be read out according to Indian System? (Ans)**

**2) Write the following using comma in International System of Numeration.**(a) 645340001 (Ans) (b)65771238 (Ans) (c)82347192 (Ans)

**3) Round 526 to nearest tens.(Ans)**

**4) Write in Roman numerals.**(a)65 (Ans) (b)77 (Ans)

(c)96 (Ans)

(d)79 (Ans)

(e) 88 (Ans)

**5) Place commas correctly and write the numerals.**(a) Nine crore five lakh forty-one. (Ans)

(b) Fifty eight million four hundred twenty three thousand two hundred two. (Ans)

(c) Seventy-three lakh seventy-five thousand three hundred seven. (Ans)

(d)Seven crore fifty-two lakh twenty-one thousand three hundred two. (Ans)

(e)Twenty-three lakh thirty thousand ten. (Ans)

**6) a) How many thousands make a million?(Ans)**

b)How many lacs make a crore? (Ans)

b)How many lacs make a crore? (Ans)

**7) Write the sum of XX and XXIX in Roman numerals.(Ans)**

**8) Estimate the following (by rounding off to nearest tens):**(a) 941 (Ans)

(b) 312 (Ans)

(b) 777 (Ans)

(d) 13 (Ans)

(e) 309 (Ans)

(f) 654 (Ans)

**9) Estimate the following (by rounding off to nearest hundreds):**(a) 6,941 (Ans)

(b) 6,320 (Ans)

(c) 916 (Ans)

(d) 129 (Ans)

(e) 309 (Ans)

(f) 802 (Ans)

(g) 346 (Ans)

(h) 3,684 (Ans)

(i) 1,311 (Ans)

(j) 586 (Ans)

**10) Estimate the following (by rounding off to nearest thousands):**(a) 3,456 (Ans)

(b) 7,850 (Ans)

(c) 25,554 (Ans)

(d) 7,220 (Ans)

(e) 6,500 (Ans)

(f) 92,535 (Ans)

**11) Write in numbers:**

a) IX (Ans)

b) LXV (Ans)

c) C (Ans)

d) XC (Ans)

**12) Solve the following:**(a) X + V (Ans)

(b) V + III (Ans) (c) XV + II (Ans) (d) IX + IX (Ans) (e) II + VI (Ans) (f) V – I (Ans) (g) VII - IV (Ans) (h) IX – III (Ans) (i) XL – VII (Ans)

**Q.13**How many millions make a billion? (Ans)

**Q. 14 Write the smallest 3 digit number which does not change if the digits are written in reversed order.(Ans)**

**Q.15**Find the difference between the number 279 and that obtained on reversing its digits.(Ans)**Q.16**Write all possible 3-digit numbers using the digits 6,0,4 when repetition of digits is not allowed.(Ans)**worksheet on number system**

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