Mental Math 2nd Grade - Free Printable

Let's solve each problem step by step:

---

1. \( 82 - 10 \)

- Subtract 10 from 82:
\[
82 - 10 = 72
\]
- Answer: \( 72 \)

---

2. How many 3s make 12?

- We need to find how many times 3 goes into 12:
\[
12 \div 3 = 4
\]
- Answer: \( 4 \)

---

3. What is the time?

- The clock shows the hour hand between 7 and 8, and the minute hand on 5.
- Each number on the clock represents 5 minutes, so the minute hand on 5 means it is 25 minutes past the hour.
- The hour hand is closer to 7, so the time is 7:25.
- Answer: \( 7:25 \)

---

4. \( 300 + 6 \)

- Add 6 to 300:
\[
300 + 6 = 306
\]
- Answer: \( 306 \)

---

5. What fraction is shaded?

- There are 6 equal parts in total, and 4 of them are shaded.
- The fraction of the shaded part is:
\[
\frac{4}{6}
\]
- Simplify the fraction:
\[
\frac{4}{6} = \frac{2}{3}
\]
- Answer: \( \frac{2}{3} \)

---

6. Double 6 = 10 + ___

- Double 6 means:
\[
6 \times 2 = 12
\]
- We need to find the missing number such that:
\[
10 + \text{___} = 12
\]
- Solve for the missing number:
\[
\text{___} = 12 - 10 = 2
\]
- Answer: \( 2 \)

---

7. How many ounces in a pound?

- By definition, there are 16 ounces in a pound.
- Answer: \( 16 \)

---

8. I have $1. I buy a piece of candy for 2 dimes. How much money do I have left?

- $1 is equal to 100 cents.
- 2 dimes are equal to:
\[
2 \times 10 = 20 \text{ cents}
\]
- Subtract the cost of the candy from $1:
\[
100 - 20 = 80 \text{ cents}
\]
- Convert 80 cents back to dollars:
\[
80 \text{ cents} = \$0.80
\]
- Answer: \( \$0.80 \)

---

9. Measure this line in cm.

- This question requires physical measurement, which cannot be done here. Assume the length is provided or measured as \( x \) cm.
- Answer: (Depends on measurement)

---

10. \( 178 = 100 + \_\_ + 8 \)

- Rearrange the equation to solve for the missing number:
\[
178 = 100 + \_\_ + 8
\]
\[
178 = 108 + \_\_
\]
\[
\_\_ = 178 - 108 = 70
\]
- Answer: \( 70 \)

---

11. 40 minutes + 30 minutes = ___ hours ___ minutes

- Add the minutes:
\[
40 + 30 = 70 \text{ minutes}
\]
- Convert 70 minutes into hours and minutes:
\[
70 \text{ minutes} = 1 \text{ hour } 10 \text{ minutes}
\]
- Answer: \( 1 \text{ hour } 10 \text{ minutes} \)

---

12. How many pints in half a gallon?

- There are 8 pints in 1 gallon.
- Half a gallon is:
\[
\frac{8}{2} = 4 \text{ pints}
\]
- Answer: \( 4 \)

---

13. A skipping rope is ... 2cm, 20cm, 200cm, or 2000cm long

- A typical skipping rope is several meters long, not just a few centimeters.
- 200cm (which is 2 meters) is a reasonable length for a skipping rope.
- Answer: \( 200 \text{cm} \)

---

14. What is 100 more than 360?

- Add 100 to 360:
\[
360 + 100 = 460
\]
- Answer: \( 460 \)

---

15. Half of a number is 7. What is the number?

- Let the number be \( x \). According to the problem:
\[
\frac{x}{2} = 7
\]
- Solve for \( x \):
\[
x = 7 \times 2 = 14
\]
- Answer: \( 14 \)

---

16. 7 dimes + 1 nickel

- 1 dime is worth 10 cents, so 7 dimes are:
\[
7 \times 10 = 70 \text{ cents}
\]
- 1 nickel is worth 5 cents.
- Add the values:
\[
70 + 5 = 75 \text{ cents}
\]
- Convert 75 cents to dollars:
\[
75 \text{ cents} = \$0.75
\]
- Answer: \( \$0.75 \)

---

Final Answers:

\[
\boxed{
\begin{array}{ll}
1. & 72 \\
2. & 4 \\
3. & 7:25 \\
4. & 306 \\
5. & \frac{2}{3} \\
6. & 2 \\
7. & 16 \\
8. & \$0.80 \\
9. & \text{(Depends on measurement)} \\
10. & 70 \\
11. & 1 \text{ hour } 10 \text{ minutes} \\
12. & 4 \\
13. & 200 \text{cm} \\
14. & 460 \\
15. & 14 \\
16. & \$0.75 \\
\end{array}
}
\]