10


Decimals


We are learning to: Compare and order decimals. Add, subtract, multiply and divide decimals.


Round decimals to one decimal place. Day One Study the steps used to solve the problem in the example below.


Rebecca cycled 15.05 km on Friday, half this distance on Saturday and 20.004 km on Sunday. What was the average distance that she cycled over the three days?


Circle the numbers and keywords: 15.05 km, half, 20.004 km, average


Top tip: It is very


important to


keep the decimal point directly underneath the decimal point when adding and subtracting.


Try these. 1


Link with operation needed (+, −, × or ÷): Add (+). Divide (÷). Use a strategy: Simplify – break it into steps.


Estimate and calculate: My estimate: approximately 15 km


15.05 km 7.525 km


+ 20.004 km 42.579 km


42.579 km ÷ 3 =


14.193 km Answer: 14.193 km


Summarise and check how you got your answer: I found the distances cycled, then added the three distances and divided by 3 to find the average.


Senan bought 0.6 kg of sweets, Sam bought 0.425 kg of sweets and Simon bought 0.09 kg of sweets. What was the total weight of the sweets that the boys bought?


2


On Sunday morning, the owner of a sweet shop opened a new jar containing 2 kg of apple sours. By the end of the day, there was only 205 g left. What weight of apple sours had been sold? Write your answer in decimal form.


3


Cola bottles cost €0.37 per 20 g. If Denise bought 460 g of cola bottles, how much money did she spend?


Top tip: When multiplying decimals, remember to count back the correct number of decimal places.


44 Strand: Number Strand Unit: Decimals Answer: Marks: Today’s Marks: /2 /6


Answer:


Marks:


/2


Answer:


Marks:


/2


Week 10


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