Cleaning windows

Cleaning windows

Pencil and paperOnline interactive
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about using multiplication to solve maths problems.
building
Jo is a window cleaner. The building she cleans:
  • has 6 floors
  • has 5 windows on each floor
  • takes Jo 2 minutes to clean each window.

Question 1Change answer

a)   i)  How long does it take Jo to clean the top floor windows?  minutes
      ii) Which numbers did you multiply? 

Question 1Change answer

b)   i)  How long does it take Jo to clean all the windows in the building?  minutes
      ii) Which numbers did you multiply? 

Question 2Change answer

c)  Jo sees 4 people through each window in the building. 
     How many people does she see altogether? 
Task administration: 
This task is completed with pencil and paper or online.
Level:
3
Curriculum info: 
Maths, Number and Algebra, Number Strategies
Keywords: 
multiplication
Description of task: 
Students use multiplication to solve problems about window cleaning an office building.
Curriculum Links: 
This resource can help to identify students' ability to apply additive or simple multiplicative ideas flexibly to combine or partition whole numbers to solve multiplication problems.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Multiplicative thinking, sets 4-5
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 

 

Y7 (06/1996)

Y8 (06/1996)
a)

i)
ii)

10
5 × 2

very easy
moderate

very easy
easy
b)

i) 
ii)

60 [Accept 1 hour or answer to a) i) × 6.]
6 × 5 × 2 [Accept 30 × 2 or 10 × 6 or answer to a) i) × 6 or answer to a) ii) × 6.]

easy
moderate

easy 
moderate
c)   120 people moderate moderate