Everyday Mathematics: Number Names and Sense | Mathematics Olympiad for Class 1 PDF Download

Q1. A shop sells "thirty-two" notebooks on Monday and "fifteen" on Tuesday. What is the total number of notebooks sold, written in words?
(a) Forty-six
(b) Forty-seven
(c) Forty-eight
(d) Forty-nine
Ans: (b) Forty-seven

Total notebooks = 32 + 15 = 47. 
47 is written as "forty-seven" (40 = forty, 7 = seven).

Q2. A basket has "forty-nine" oranges. If "seventeen" are taken out, how many oranges are left, in words?
(a) Thirty-one
(b) Thirty-two
(c) Thirty-three
(d) Thirty-four
Ans: (b) Thirty-two

Oranges left = 49 - 17 = 32.
32 is "thirty-two" (30 = thirty, 2 = two).

Q3. A teacher writes "forty-five" on the board. How many tens are in this number?
(a) Four
(b) Five
(c) Six
(d) Seven
Ans: (a) Four

"Forty-five" is 45. 
In place value, 45 = 4 tens (40) + 5 ones. So, the number of tens is 4.

Q4. A book has "fifty" pages. If Ravi reads "twenty-three" pages, how many pages are left, written in words?
(a) Twenty-six
(b) Twenty-seven
(c) Twenty-eight
(d) Twenty-nine
Ans: (b) Twenty-seven

 Pages left = 50 - 23 = 27. 
 27 is "twenty-seven" (20 = twenty, 7 = seven).

Q5. Which of the following is the correct spelling for the number 15?
(a) Fiveteen
(b) Fifeteen
(c) Fifteen
(d) Fivteen

Ans: (c) Fifteen

The number 15 follows the pattern of numbers from 13 to 19 where we add "-teen". The correct spelling is "fifteen" (not fiveteen or fifeteen).

Q6. What is the sum of "twenty-five" and "fourteen" in word form?
(a) Thirty-nine
(b) Twenty-nine
(c) Forty-nine
(d) Thirty-eight

Ans: (a) Thirty-nine

Twenty-five = 25
Fourteen = 14
Total = 25 + 14 = 39
39 in words is "thirty-nine".

Q7. What is the word form of the expression: (30 + 9)?
(a) Thirty-nine
(b) Twenty-nine
(c) Three-nine
(d) Thirty-nine

Ans: (a) Thirty-nine

30 = "thirty", 9 = "nine"
"thirty-nine"

Q8. A baker makes "forty-one" cookies in the morning and "nine" in the afternoon. What is the total number of cookies, in words?
(a) Forty-eight
(b) Forty-nine
(c) Fifty
(d) Fifty-one
Ans: (c) Fifty

Total cookies = 41 + 9 = 50. 
50 is "fifty."

Q9. A bus has "forty-four" seats. If "eighteen" passengers board, how many seats are left empty, in words?
(a) Twenty-five
(b) Twenty-six
(c) Twenty-seven
(d) Twenty-eight
Ans: (b) Twenty-six

Empty seats = 44 - 18 = 26. 
26 is "twenty-six" (20 = twenty, 6 = six).

Q10. A gardener plants "sixteen" roses in one row and "twenty-nine" in another. What is the total number of roses, in words?
(a) Forty-four
(b) Forty-five
(c) Forty-six
(d) Forty-seven
Ans: (b) Forty-five

Total roses = 16 + 29 = 45. 
45 is "forty-five" (40 = forty, 5 = five).