Down at the beach 0 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. Nina's class went to the beach. Question 1Change answer a) Here are all the shells Nina's class found at the beach. 42 shells 34 shells 27 shells Write an equation in the box below for the number of shells they found. Put the answer with your equation. a) Here are all the shells Nina's class found at the beach. 42 shells 34 shells 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 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. 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 FrameworksThis 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. Looking at zero II Number sentences III Find the missing numbers How to work out the answer Number pairs Tens frames to twenty Looking at zero