Sums, differences and products

Sums, differences and products

Pencil and paperOnline interactive
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Working with Students
Further Resources
This task is about basic facts.
 
Joey has forgotten some of his basic fact tables. Help Joey by filling in two numbers in the spaces to make each row true.
The first one has been done for you by writing in the numbers 6 and 7.  

Question 1Change answer

  Numbers Sum Difference Product
a) 6   and   7 13 1 42
b)    and    7 1 12
c)    and    9 1 20
d)    and    9 3 18
e)    and    12 0 36
f)    and    12 8 20
g)    and    13 3 40
h)    and    11 5 24
 
Task administration: 
This task can be completed with pen and paper or online (with NO auto marking).
Level:
3
Curriculum info: 
Maths, Number and Algebra, Number Knowledge
Keywords: 
multiplication, factors, addition, basic facts, subtraction
Description of task: 
Students use given sums, differences, and products to identify factors in each basic fact.
Answers/responses: 
 

Y6 (08/2002)
b) 3 and 4 or 4 and 3 easy
c) 4 and 5 or 5 and 4 easy
d) 3 and 6 or 6 and 3 easy
e) 6 and 6 easy
f) 2 and 10 or 10 and 2 moderate
g) 5 and 8 or 8 and 5 moderate
h) 3 and 8 or 8 and 3 difficult

 

Diagnostic and formative information: 
  

Common error

b)-h)

 Puts in numbers where only the sum is correct. This is particularly true for the harder parts f), g), and h).