Decimal Calculations 6
Problems Involving Multiplication

We now see how multiplication helps when solving problems in context.

Worked Examples

1

In a train there are 6 coaches each with 68 seats and two coaches each with 42 seats.

What is the total seating capacity of the train?

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The total number of seats = 6 × 68 + 2 × 42
= 408 + 84
= 492 seats
2

Find the cost of 12 lunches, each costing £3.29.

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You can use long multiplication to get the answer.

3.29
×12
3290
+658
£39.48

Exercises

It costs £9 to go on a school trip. A class of 28 children all go on the trip. How much do they pay in total?

£

Chocolate bars are packed in boxes. Each box contains 24 bars. Mrs Patel buys 8 boxes for the tuck shop. How many bars does she buy?

bars

A train has 8 carriages. There are 52 seats in each carriage. How many seats are there on the train?

seats

A milk crate contains 24 bottles of milk. There are 32 crates on a milk float. How many bottles are there on the milk float?

bottles

Matthew organises a trip to a concert. He buys 32 tickets which cost £35 each. How much does he spend on the tickets?

£

Shamil helps his parents build a patio. It is rectangular. There are 12 slabs along one side and 18 along the other side. How many slabs are there in the patio?

slabs

A burger costs £1.29. Find the cost of 10 burgers.

£

Alex earns £2.54 each day for his paper round. How much does he earn in 6 days?

£

A meal for an adult costs £4.99 and a meal for a child costs £2.25. Find the total cost of 2 adult and 4 child meals.

£

Rope is sold for £1.28 per metre. Find the cost of 10 metres of rope.

£

The price of a carpet is £4.99 per square metre. Find the cost of 8 square metres of carpet.

£

Chain is sold for £2.44 per metre. Find the cost of 3.2 metres of chain.

£ to the nearest penny

Apples are sold for £1.06 per kilogram. Find the cost of 2.4 kilograms of apples.

£ to the nearest penny