Grade 5 interactive quiz: Solving problems with large numbers and decimals

📚 Quick Study Guide

• 🔢 Place Value: Understanding place value is key! Remember that each digit in a number has a specific value depending on its position. For example, in the number 123.45, 1 is in the hundreds place, 2 is in the tens place, 3 is in the ones place, 4 is in the tenths place, and 5 is in the hundredths place.
• ➕ Adding and Subtracting Decimals: Always line up the decimal points when adding or subtracting decimals. Add zeros as placeholders if needed!
• ✖️ Multiplying Decimals: Multiply decimals as you would whole numbers. Then, count the total number of decimal places in the factors and place the decimal point in the product accordingly.
• ➗ Dividing Decimals: Make the divisor a whole number by moving the decimal point to the right. Move the decimal point in the dividend the same number of places. Then divide as usual.
• 🧮 Rounding Decimals: Identify the place value you're rounding to. Look at the digit to the right. If it's 5 or greater, round up. If it's less than 5, round down.
• 💡 Estimating: Estimating can help you check if your answers are reasonable. Round the numbers to the nearest whole number or ten before performing the operation.

🧪 Practice Quiz

1. What is the sum of 123.45 and 67.89?
   1. A) 191.34
   2. B) 190.34
   3. C) 191.24
   4. D) 190.24
2. What is the result of subtracting 45.67 from 200?
   1. A) 154.33
   2. B) 155.33
   3. C) 165.33
   4. D) 164.33
3. What is the product of 12.5 and 3.2?
   1. A) 40
   2. B) 30
   3. C) 400
   4. D) 3.0
4. What is the quotient of 144 divided by 2.4?
   1. A) 6
   2. B) 60
   3. C) 0.6
   4. D) 0.06
5. Round 345.678 to the nearest tenth.
   1. A) 345.6
   2. B) 345.7
   3. C) 345.68
   4. D) 346
6. Estimate the sum of 28.7 + 41.2 + 19.9.
   1. A) 70
   2. B) 80
   3. C) 90
   4. D) 100
7. What is 567.89 - 123.45?
   1. A) 444.44
   2. B) 691.34
   3. C) 444.34
   4. D) 690.34