Year 5 Maths: Ounces, Pounds, Stones, and Tons

Introduction to Weight

Hello, Year 5! Today, we are going to learn about weights. We will focus on four units of weight: ounces, pounds, stones, and tons. These are commonly used in the UK to measure how heavy things are. Let’s break them down.

Ounces

1. What is an ounce?
   • An ounce (oz) is a small unit of weight.
   • There are 16 ounces in 1 pound.
2. Example:
   • A slice of bread weighs about 1 ounce.

Pounds

1. What is a pound?
   • A pound (lbs) is larger than an ounce.
   • It is often used for heavier items.
   • There are 2.2 pounds in 1 kilogram.
2. Example:
   • A bag of sugar usually weighs 2 pounds.

Stones

1. What is a stone?
   • A stone (st) is another unit of weight used mainly in the UK.
   • There are 14 pounds in 1 stone.
2. Example:
   • A person who weighs 10 stones weighs 140 pounds (because 10 x 14 = 140).

Tons

1. What is a ton?
   • A ton is a very large unit of weight.
   • In the UK, 1 ton equals 1,000 kilograms or 2,240 pounds.
   • We also have metric tons, which are 1,000 kilograms or about 2,204 pounds.
2. Example:
   • A small car can weigh around 1 ton.

Key Rules

• Conversions:
  • To convert ounces to pounds, divide the number of ounces by 16.
  • To convert pounds to stones, divide the number of pounds by 14.
  • To convert stones to pounds, multiply the number of stones by 14.
  • To convert tons to pounds, multiply the number of tons by 2,240.
• Remember:
  • 16 ounces = 1 pound
  • 14 pounds = 1 stone
  • 1 ton = 2,240 pounds

Tips and Tricks

• Visualisation:
  • You can think of a pound as a small bag of sugar.
  • A stone is like two bags of sugar put together.
  • A ton is like a small car made up of many bags of sugar!
• Practice:
  • Use kitchen scales to weigh different foods in ounces and pounds. This will help you understand how heavy things are.

Questions

Easy Level

1. How many ounces are in 1 pound?
2. What is heavier, 1 stone or 1 pound?
3. If you have 32 ounces, how many pounds do you have?
4. How many pounds are in 2 stones?
5. What is 1 ton equal to in pounds?
6. If a slice of cheese weighs 2 ounces, how many ounces are in 4 slices?
7. How many ounces are in 3 pounds?
8. If a bag weighs 10 pounds, how many stones does it weigh?
9. How many ounces are in 1 stone?
10. What is the weight of a small car in tons?

Medium Level

1. Convert 48 ounces to pounds.
2. If you weigh 12 stones, how many pounds do you weigh?
3. How many pounds are in 5 stones?
4. How many ounces are in 3.5 pounds?
5. If a person weighs 150 pounds, how many stones do they weigh?
6. Convert 3 tons to pounds.
7. If a watermelon weighs 5 pounds, how many ounces is that?
8. How many stones are in 28 pounds?
9. If your bag weighs 2 tons, how many pounds does it weigh?
10. How many ounces are in 2 stones?

Hard Level

1. Convert 120 ounces to stones.
2. If you lift 6 stones, how many pounds are you lifting?
3. How many ounces are in 4.5 pounds?
4. If a truck weighs 3 tons, how many kilograms does it weigh?
5. If you have 5 bags of flour, each weighing 2 pounds, what is the total weight in stones?
6. Convert 10 stones to pounds.
7. How many pounds are in 7.5 tons?
8. If you have 300 ounces of flour, how many pounds is that?
9. A person weighs 11 stones and 5 pounds. What is their weight in pounds?
10. How many ounces are in 2 tons?

Answers

Easy Level Answers

1. 16 ounces
2. 1 stone
3. 2 pounds
4. 28 pounds
5. 2,240 pounds
6. 8 ounces
7. 48 ounces
8. 0.71 stones
9. 224 ounces
10. Approximately 1 ton

Medium Level Answers

1. 3 pounds
2. 168 pounds
3. 70 pounds
4. 56 ounces
5. 10.71 stones
6. 6,720 pounds
7. 80 ounces
8. 2 stones
9. 4,480 pounds
10. 32 ounces

Hard Level Answers

1. 7.5 stones
2. 84 pounds
3. 72 ounces
4. 1,360 kilograms
5. 1 stone
6. 140 pounds
7. 15,400 pounds
8. 18.75 pounds
9. 161 pounds
10. 4,480 ounces

I hope this helps you understand ounces, pounds, stones, and tons better! Keep practicing and you’ll be a weight expert in no time!