22 length is 2 m.


Circle the numbers and keywords: height is 1.2 m, length is 2 m, width is ?


Link with operation needed (+, −, × or ÷): Multiply (×). Divide (÷). Use a strategy: Work backwards.


Estimate and calculate: My estimate: less than 2 m


1.2 m × 2 m × m = 4.32 m3 2.4 m × m = 4.32 m3 4.32 m3


÷ 2.4 m = 1.8 m


Summarise and check how you got your answer: I worked backwards to find the missing value.


Try these. 1


During a car journey, Erica shared a carton of juice between herself and her family. She gave 25% of it to her sister, 2


5 of it to her cousin and 3


to her father and kept the remaining 175 ml for herself. How much juice did Erica have to begin with?


2


Erica filled her petrol tank at the garage. She used 19% of the full tank on a trip to Galway, 0.36 of the full tank driving to a concert in Sligo and the remaining 22.5 l driving to Limerick. What is the capacity of Erica’s petrol tank?


3


Based on the answer to question 2 above, if petrol costs €1.20 per litre, how much did it cost Erica to (a) fill her tank and (b) travel to Galway?


92 Strand: Measures Strand Unit: Capacity


Answer: 1.8 m


Capacity


We are learning to: Add, subtract, multiply and divide litres and millilitres. Find the volume of a cuboid experimentally.


Day One Study the steps used to solve the problem in the example below. Declan’s fish tank has a volume of 4.32 m3


. Find the width if the height is 1.2 m and the


20 of it Answer: Marks: /2


Answer:


Marks:


/2


Answers: (a)


(b)


Marks: Today’s Marks:


/4 /8


Week 22


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