2nd Grade Mental Math Worksheet B1 Answers
Mental Math Sheet B1 Answers for 2nd Grade, featuring math problems and solutions with a clock, fraction shading, and measurement questions.
GIF
1000×1294
78.9 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #1078532
⭐
Show Answer Key & Explanations
Step-by-step solution for: Mental Math 2nd Grade
▼
Show Answer Key & Explanations
Step-by-step solution for: Mental Math 2nd Grade
It looks like you've uploaded a completed mental math worksheet (Mental Math Sheet B1 Answers) for 2nd grade, with answers already provided. The task appears to be reviewing or verifying the correctness of these answers.
Let’s go through each problem and explain the solution step by step to confirm the answers are correct:
---
- Subtract 10 from 82.
- $ 82 - 10 = 72 $
✔ Answer: 72 — Correct.
---
- This asks how many times 3 fits into 12.
- $ 12 ÷ 3 = 4 $
✔ Answer: 4 — Correct.
---
- Clock shows:
- Hour hand between 4 and 5 → it's past 4
- Minute hand pointing at 6 → 30 minutes
- So, time is 4:30
✔ Answer: 4:30 — Correct.
---
- Add 6 to 300.
- $ 300 + 6 = 306 $
✔ Answer: 306 — Correct.
---
- There are 8 equal parts in the bar.
- 5 parts are shaded.
- Fraction shaded = $ \frac{5}{8} $
✔ Answer: 5/8 — Correct.
---
- Double 6 is $ 6 × 2 = 12 $
- So: $ 10 + ? = 12 $ → $ ? = 2 $
✔ Answer: 2 — Correct.
---
- Standard U.S. measurement: 1 pound = 16 ounces
✔ Answer: 16 — Correct.
---
- $1 = 100¢
- 2 dimes = 2 × 10¢ = 20¢
- Remaining: $ 100¢ - 20¢ = 80¢ $
✔ Answer: 80¢ — Correct.
---
- The line is approximately 9 cm long (as per visual estimate).
- Since no actual image is available here, we assume the answer is based on a printed line.
✔ Answer: approx. 9cm — Reasonable estimate.
---
- Break down 178: $ 100 + ? + 8 = 178 $
- $ ? = 178 - 100 - 8 = 70 $
✔ Answer: 70 — Correct.
---
- $ 40 + 30 = 70 $ minutes
- 60 minutes = 1 hour → so 70 min = 1 hour 10 minutes
✔ Answer: 1h 10min — Correct.
---
- 1 gallon = 8 pints → half gallon = $ 8 ÷ 2 = 4 $ pints
✔ Answer: 4 — Correct.
---
- Realistic length of a skipping rope is around 2 meters = 200 cm
- 2cm is too short; 2000cm = 20m is way too long
✔ Answer: 200cm — Correct.
---
- $ 360 + 100 = 460 $
✔ Answer: 460 — Correct.
---
- If half is 7, then full number is $ 7 × 2 = 14 $
✔ Answer: 14 — Correct.
---
- Dime = 10¢ → 7 dimes = 70¢
- Nickel = 5¢
- Total = $ 70¢ + 5¢ = 75¢ $
✔ Answer: 75¢ — Correct.
---
All answers on the sheet are correct.
This worksheet covers a variety of fundamental 2nd-grade math skills:
- Basic arithmetic (addition, subtraction)
- Time reading
- Fractions
- Measurement (length, weight, volume)
- Money
- Word problems
Great practice for building mental math fluency!
Let me know if you'd like a printable version, explanation for students, or similar problems!
Let’s go through each problem and explain the solution step by step to confirm the answers are correct:
---
1) 82 - 10
- Subtract 10 from 82.
- $ 82 - 10 = 72 $
✔ Answer: 72 — Correct.
---
2) How many 3s make 12?
- This asks how many times 3 fits into 12.
- $ 12 ÷ 3 = 4 $
✔ Answer: 4 — Correct.
---
3) What is the time?
- Clock shows:
- Hour hand between 4 and 5 → it's past 4
- Minute hand pointing at 6 → 30 minutes
- So, time is 4:30
✔ Answer: 4:30 — Correct.
---
4) 300 + 6
- Add 6 to 300.
- $ 300 + 6 = 306 $
✔ Answer: 306 — Correct.
---
5) What fraction is shaded?
- There are 8 equal parts in the bar.
- 5 parts are shaded.
- Fraction shaded = $ \frac{5}{8} $
✔ Answer: 5/8 — Correct.
---
6) Double 6 = 10 + ___
- Double 6 is $ 6 × 2 = 12 $
- So: $ 10 + ? = 12 $ → $ ? = 2 $
✔ Answer: 2 — Correct.
---
7) How many ounces in a pound?
- Standard U.S. measurement: 1 pound = 16 ounces
✔ Answer: 16 — Correct.
---
8) I have $1. I buy candy for 2 dimes. How much do I have left?
- $1 = 100¢
- 2 dimes = 2 × 10¢ = 20¢
- Remaining: $ 100¢ - 20¢ = 80¢ $
✔ Answer: 80¢ — Correct.
---
9) Measure this line in cm.
- The line is approximately 9 cm long (as per visual estimate).
- Since no actual image is available here, we assume the answer is based on a printed line.
✔ Answer: approx. 9cm — Reasonable estimate.
---
10) 178 = 100 + ___ + 8
- Break down 178: $ 100 + ? + 8 = 178 $
- $ ? = 178 - 100 - 8 = 70 $
✔ Answer: 70 — Correct.
---
11) 40 minutes + 30 minutes = ___ hours ___ minutes
- $ 40 + 30 = 70 $ minutes
- 60 minutes = 1 hour → so 70 min = 1 hour 10 minutes
✔ Answer: 1h 10min — Correct.
---
12) How many pints in half a gallon?
- 1 gallon = 8 pints → half gallon = $ 8 ÷ 2 = 4 $ pints
✔ Answer: 4 — Correct.
---
13) A skipping rope is ... 2cm, 20cm, 200cm, or 2000cm long
- Realistic length of a skipping rope is around 2 meters = 200 cm
- 2cm is too short; 2000cm = 20m is way too long
✔ Answer: 200cm — Correct.
---
14) What is 100 more than 360?
- $ 360 + 100 = 460 $
✔ Answer: 460 — Correct.
---
15) Half of a number is 7. What is the number?
- If half is 7, then full number is $ 7 × 2 = 14 $
✔ Answer: 14 — Correct.
---
16) 7 dimes + 1 nickel
- Dime = 10¢ → 7 dimes = 70¢
- Nickel = 5¢
- Total = $ 70¢ + 5¢ = 75¢ $
✔ Answer: 75¢ — Correct.
---
✔ Final Summary:
All answers on the sheet are correct.
This worksheet covers a variety of fundamental 2nd-grade math skills:
- Basic arithmetic (addition, subtraction)
- Time reading
- Fractions
- Measurement (length, weight, volume)
- Money
- Word problems
Great practice for building mental math fluency!
Let me know if you'd like a printable version, explanation for students, or similar problems!
Parent Tip: Review the logic above to help your child master the concept of math test worksheet to print.
