Page 93 - SK Year 5 Mathematics DLP

2 The mass of a laptop is 1.26 kg.
Box A as shown on the right can
support a maximum mass of
14 kg. Can the box accommodate
the total mass of 12 similar laptops?

Understand the problem

• A laptop has a mass of 1.26 kg.
• Box A can support 14 kg.
• Can box A accommodate the total mass of 12 similar laptops?

Plan the strategy

the mass of the mass of Does the total mass
1 laptop 1.26 kg 12 similar laptops of 12 similar laptops
12 × 1.26 kg = ? exceed 14 kg?

Solve Check

12 × 1.26 kg = kg 1 . 2 6 kg
1 12 1 5 . 1 2 kg
1 . 2 6 kg − 1 2
× 1 2 3 1
1 − 2 4
2 5 2 7 2
+ 1 2 6 0 − 7 2
1 5 . 1 2 kg 0

12 × 1.26 kg = 15.12 kg

Box A cannot accommodate the total mass of 12 similar laptops.

Types of box Mass of item
Based on the table, choose
P up to 10 kg a suitable box to deliver the
12 laptops above. Discuss.
Q 10 kg to 20 kg

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2.4.1 • Guide pupils to solve the mascot’s question using Trial and Error” method.