Key2Practice Maths Olympiad For Class 1 : 24 Tests, 600 Math Questions, Activity Based Worksheets - Free Printable

Let's solve each problem step by step:

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Problem 13:

Rohan sells 23 eggs on Monday, 14 eggs on Tuesday, and 11 eggs on Wednesday. How many eggs does he sell in total?

- Eggs sold on Monday: 23
- Eggs sold on Tuesday: 14
- Eggs sold on Wednesday: 11

Total eggs sold = \( 23 + 14 + 11 \)

Perform the addition:
\[
23 + 14 = 37
\]
\[
37 + 11 = 48
\]

So, the total number of eggs sold is 48.

Answer: c) Forty-eight

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Problem 14:

Which of the following represents the number shown on the abacus?

The abacus shows:
- 1 bead in the tens place (representing 10)
- 7 beads in the ones place (representing 7)

Thus, the number represented is \( 10 + 7 = 17 \).

Now, we need to find which option equals 17:
a) \( 37 + 52 = 89 \)
b) \( 54 + 43 = 97 \)
c) \( 45 + 34 = 79 \)
d) \( 61 + 23 = 84 \)

None of these options equal 17. However, if there was a typo or misunderstanding, the correct representation should be checked again. Assuming the question is correctly stated, none of the provided options match.

Answer: None of the options are correct.

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Problem 15:

Identify the number.
- It is a 2-digit number.
- Sum of its digits is 9.
- If you add 13 to the number, it will become 67.

Let the number be \( x \).

From the third condition:
\[
x + 13 = 67
\]
Solve for \( x \):
\[
x = 67 - 13 = 54
\]

Check the other conditions:
1. \( x \) is a 2-digit number: \( 54 \) is a 2-digit number.
2. Sum of its digits: \( 5 + 4 = 9 \).

Both conditions are satisfied.

Answer: a) 54

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Problem 16:

Who am I?
- I am a two-digit number.
- I am greater than \( 23 + 15 \) but less than \( 32 + 12 \).

First, calculate the given sums:
\[
23 + 15 = 38
\]
\[
32 + 12 = 44
\]

The number must satisfy:
\[
38 < x < 44
\]

The possible two-digit numbers in this range are: 39, 40, 41, 42, 43.

From the options:
a) 27 (not in the range)
b) 42 (in the range)
c) 45 (not in the range)
d) 38 (not in the range)

Answer: b) 42

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Problem 17:

Which of the following is the same as the number on cloud?
The cloud says:
\[
\text{Fifty-six} + \text{Forty-three}
\]

Calculate:
\[
56 + 43 = 99
\]

Now, check the options:
a) Ninety-nine: This matches 99.
b) 9 tens 9 ones: This also means \( 90 + 9 = 99 \).

Both options (a) and (b) are correct.

Answer: c) Both (a) and (b)

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Problem 18:

Which of the following is incorrect?

Check each option:
a) \( 32 + 13 = 45 \)
\[
32 + 13 = 45 \quad \text{(Correct)}
\]

b) \( 41 + 18 = 58 \)
\[
41 + 18 = 59 \quad \text{(Incorrect, should be 59, not 58)}
\]

c) \( 25 + 23 = 48 \)
\[
25 + 23 = 48 \quad \text{(Correct)}
\]

d) \( 80 + 19 = 99 \)
\[
80 + 19 = 99 \quad \text{(Correct)}
\]

The incorrect option is b).

Answer: b) \( 41 + 18 \)

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Problem 19:

Select the correct match.

Check each option:
a) \( 2 \text{ tens } 4 \text{ ones } + 3 \text{ tens } 5 \text{ ones } = 59 \)
\[
24 + 35 = 59 \quad \text{(Correct)}
\]

b) \( 1 \text{ ten } 5 \text{ ones } + 4 \text{ tens } 4 \text{ ones } = 59 \)
\[
15 + 44 = 59 \quad \text{(Correct)}
\]

c) \( 3 \text{ tens } 2 \text{ ones } + 5 \text{ tens } 3 \text{ ones } = 85 \)
\[
32 + 53 = 85 \quad \text{(Correct)}
\]

d) \( 4 \text{ tens } 3 \text{ ones } + 1 \text{ ten } 4 \text{ ones } = 57 \)
\[
43 + 14 = 57 \quad \text{(Correct)}
\]

All options are correct. However, if only one match is required, the first correct match is:
Answer: a) \( 2 \text{ tens } 4 \text{ ones } + 3 \text{ tens } 5 \text{ ones } = 59 \)

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Final Answers:

1. 13: c) Forty-eight
2. 14: None of the options are correct.
3. 15: a) 54
4. 16: b) 42
5. 17: c) Both (a) and (b)
6. 18: b) \( 41 + 18 \)
7. 19: a) \( 2 \text{ tens } 4 \text{ ones } + 3 \text{ tens } 5 \text{ ones } = 59 \)

Boxed Final Answer:
\[
\boxed{c, \text{None}, a, b, c, b, a}
\]