# Functional Skills: Weight

## Functional Skills: Weight Revision

**Weight**

The **weight** of an object is how heavy it is.

**Units of Weight**

The most used units for **weight **are **grams (g)** and **kilograms (kg)**.

There are 1000 **grams **in a **kilogram**.

So to convert between **grams **and **kilograms**, you multiply/divide by 1000.

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**Comparing Weights**

In questions or real life you may need to **compare objects in terms of weight** i.e. which object is the heaviest or lightest.

**Example: **Abigail, Owen and Elizabeth are all in a lift, their total weight is 192 kg. The **maximum weight** of the lift is 250 kg. 4 more people are waiting to get into the lift, with their weights shown in the table on the right.

Which person should they let into the lift, to ensure that the maximum weight of the lift is **not **exceeded?

Subtracting 192 kg from 250 kg gives us 58 kg.

So the additional person must be 58 kg or less.

Only **Maya **is 58 kg or less, so she should be allowed to go into the lift.

**Note:**

**Weight** can also be measured in **stone** (st), **pounds** (lbs) and **ounces****Â **(oz).

An example of these units being used is when **measuring someone’s weight** e.g. a person might weigh 9 stone 8 pounds.

**Example 1: ****Weight Calculations**

Pedro is packing his shopping up at the supermarket. Each plastic bag **can only carry** \boldsymbol{4}Â kg.

Here is a list of the items he has bought and their corresponding weights:

- Lemonade – 2 kg
- Bottled water – 2.5 kg
- Eggs – 600 g
- Bread – 350 g
- Potatoes – 3 kg

Work out **how many plastic bags** Pedro will need.

**[3 marks]**

First, we need to convert the **weight of eggs and bread to kilograms**:

Eggs – 600 g =\boldsymbol{0.6} kg

Bread – 350 g =\boldsymbol{0.35} kg

Then add up all of the weights of the items:

2+2.5+0.6+0.35+3=\boldsymbol{8.45} kg

So, we can see that the number of plastic bags Pedro needs is \boldsymbol{3}.

2 bags wouldn’t be enough as this would mean Pedro would only be able to carry 8 kg of shopping.

**Example 2: Weight Calculations**

Hazel is packing her rucksack for a camping trip she is going on.

The table to the right shows the items she is taking.

Calculate the weight of the rucksack when it is **full**.

**Adding** up the weights of the items:

2.5+3.4+1.2+0.4+0.15=7.65 kg

So the full rucksack weighs \boldsymbol{7.65} **kg**.

## Functional Skills: Weight Example Questions

**Question 1: **Add up the following weights:

316 g, 653 g, 95 g, 249 g

Give your answer in kilograms.

**[2 marks]**

316+653+95+249=1313 g

Converting this to kilograms:

1313 g =1313\div1000=1.313 kg

**Question 2:** Daniel wants to buy exactly 8 kg of flour. The flour comes in 3 different sized bags: 500 g, 1 kg and 2.5 kg. What is the smallest number of bags Daniel can buy?

**[2 marks]**

7.5+0.5=8

So the minimum number of bags is 4

This would be three 2.5 kg bags and one 500 g bag.

**Question 3: **Molly has a 4 kg bag of soil. She is going plant as many plants as possible, with each plant needing 250 g of soil. Calculate how many she can plant.

**[2 marks]**

Convert 4 kg into grams:

4 kg =4\times1000=4000 grams

4000\div250=16 plants

**Question 4: **The recommended maximum weight of a plastic bag at a supermarket is 18 kg.

Ella already has items in her bag that have a total weight of 16.2 kg.

Which of the items in the table below would **not** be able to go into the plastic bag to keep it under the maximum recommendedÂ weight?

**[2 marks]**

To find out the maximum weight of the final item we need to subtract 16.2 kg from 18 kg.

18-16.2=1.8

So the maximum weight of the additional item is 1.8 kg.

Milk and potatoes are both greater than 1.8 kg (1.9 kg and 2.5 kg respectively), so these cannot go in the plastic bag.

**Question 5: **Jacob is baking 4 birthday cakes and needs 1.6 kg of flour. He finds 3 different bags of flour in his cupboard.

Bag 1 has 600 g of flour in

Bag 2 has 0.7 kg of flour in

Bag 3 has 350 g of flour in

Does Jacob have enough flour to make the 4 cakes?

**[2 marks]Â **

First we need to convert 1.6 kilograms into grams:

1.6 kg =1600 g

Then convert 0.7 kg into grams:

0.7 kg =700 g

Finally, add up the total amount of flour:

600 g +\,700 g +\,350 g =1650 g

So Jacob does have enough flour.