Down at the beach

Down at the beach

Pencil and paperOnline interactive
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Working with Students
Further Resources
This task is about addition and subtraction with number sentences.
beach bucket and spade.png
Nina's class went to the beach.

Question 1Change answer

a)  Here are all the shells Nina's class found at the beach.

first type of shell
42 shells
second type of shell
34 shells
third type of shell
27 shells
Write an equation in the box below for the number of shells they found.
Put the answer with your equation.
Answer: 

Question 1Change answer

seal
b)  The class saw 48 seals on the rocks, but 19 swam away. 
Write an equation in the box for the number of seals that were left.
Put the answer with your equation.
Answer: 
Task administration: 
This task can be completed online or with pencil and paper with some auto-marking.
Level:
2
Curriculum info: 
Maths, Number and Algebra, Equations and expressions
Keywords: 
addition, subtraction, number sentences
Description of task: 
Students use addition and subtraction to solve story problems and show their equations.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Using symbols and expressions to think mathematically, set 3
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
  Y4 (06/1999)
a) For writing the sum 42 + 34 + 27.
For including the answer of 103.		 easy
moderate
b) For writing the difference 48 - 19.
For calculating the answer of 29.		 easy
difficult
Diagnostic and formative information: 
  Common error Likely calculation Likely reason
b) 31 (or 21)

30

 9 - 8 = 1            40 - 10 = 30

8 - 9 = 0

 "Won't go" subtraction error 
(does 9 - 8 instead of 18 - 9).
"Won't go" subtraction error.