Grade 2 Mental Math Worksheet with number ordering, counting, and comparison exercises.

Mental Maths Worksheet-1 Solution and Explanation

#### Part 1: Write in increasing order

Task: Arrange the given numbers in ascending order (smallest to largest).

##### (1) Numbers: 48, 75, 32, 68, 48, 58
- First, identify all the numbers: 48, 75, 32, 68, 48, 58.
- Arrange them in increasing order:
- Start with the smallest number: 32.
- Next is 48 (appears twice).
- Then 58.
- Followed by 68.
- Finally, the largest number is 75.

Answer:
32, 48, 48, 58, 68, 75

##### (2) Numbers: 72, 84, 43, 100, 32, 99
- Identify all the numbers: 72, 84, 43, 100, 32, 99.
- Arrange them in increasing order:
- Start with the smallest number: 32.
- Next is 43.
- Then 72.
- Followed by 84.
- Then 99.
- Finally, the largest number is 100.

Answer:
32, 43, 72, 84, 99, 100

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#### Part 2: Write in decreasing order

Task: Arrange the given numbers in descending order (largest to smallest).

##### (1) Numbers: 92, 48, 85, 62, 39, 100
- Identify all the numbers: 92, 48, 85, 62, 39, 100.
- Arrange them in decreasing order:
- Start with the largest number: 100.
- Next is 92.
- Then 85.
- Followed by 62.
- Then 48.
- Finally, the smallest number is 39.

Answer:
100, 92, 85, 62, 48, 39

##### (2) Numbers: 14, 98, 76, 85, 45, 68
- Identify all the numbers: 14, 98, 76, 85, 45, 68.
- Arrange them in decreasing order:
- Start with the largest number: 98.
- Next is 85.
- Then 76.
- Followed by 68.
- Then 45.
- Finally, the smallest number is 14.

Answer:
98, 85, 76, 68, 45, 14

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#### Part 3: Counting backwards write 69 – 58

Task: Count backwards from 69 to 58 and fill in the missing numbers.

##### (1) Sequence: 69, ____, ____, ____, ____, ____
- Start at 69 and count backwards by subtracting 1 each time:
- 69 → 68 → 67 → 66 → 65 → 64 → 63

Answer:
69, 68, 67, 66, 65, 64

##### (2) Sequence: ____, ____, ____, ____, ____, 58
- Start at 58 and count backwards by adding 1 each time until you reach the starting point:
- 58 → 59 → 60 → 61 → 62 → 63 → 64

Answer:
64, 63, 62, 61, 60, 58

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#### Part 4: Put > or < sign in the blank space

Task: Compare the values of the given expressions and insert the correct inequality sign (`>` or `<`).

##### (1) 60 + 7 ____ 48
- Calculate the left side: \( 60 + 7 = 67 \).
- Compare: \( 67 > 48 \).

Answer:
\( 60 + 7 > 48 \)

##### (2) 90 – 4 ____ 85
- Calculate the left side: \( 90 - 4 = 86 \).
- Compare: \( 86 > 85 \).

Answer:
\( 90 - 4 > 85 \)

##### (3) 33 + 1 ____ 27
- Calculate the left side: \( 33 + 1 = 34 \).
- Compare: \( 34 > 27 \).

Answer:
\( 33 + 1 > 27 \)

##### (4) 70 – 7 ____ 66
- Calculate the left side: \( 70 - 7 = 63 \).
- Compare: \( 63 < 66 \).

Answer:
\( 70 - 7 < 66 \)

##### (5) 46 + 2 ____ 53
- Calculate the left side: \( 46 + 2 = 48 \).
- Compare: \( 48 < 53 \).

Answer:
\( 46 + 2 < 53 \)

##### (6) 50 – 5 ____ 50
- Calculate the left side: \( 50 - 5 = 45 \).
- Compare: \( 45 < 50 \).

Answer:
\( 50 - 5 < 50 \)

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Final Answer:

\[
\boxed{
\begin{array}{l}
\text{(1) Increasing order: } 32, 48, 48, 58, 68, 75 \\
\text{(2) Increasing order: } 32, 43, 72, 84, 99, 100 \\
\text{(3) Decreasing order: } 100, 92, 85, 62, 48, 39 \\
\text{(4) Decreasing order: } 98, 85, 76, 68, 45, 14 \\
\text{(5) Counting backwards: } 69, 68, 67, 66, 65, 64 \\
\text{(6) Counting backwards: } 64, 63, 62, 61, 60, 58 \\
\text{(7) Inequality: } 60 + 7 > 48 \\
\text{(8) Inequality: } 90 - 4 > 85 \\
\text{(9) Inequality: } 33 + 1 > 27 \\
\text{(10) Inequality: } 70 - 7 < 66 \\
\text{(11) Inequality: } 46 + 2 < 53 \\
\text{(12) Inequality: } 50 - 5 < 50 \\
\end{array}
}
\]