Pattern Spotting Year 3 Addition and Subtraction Learning Video Clip

Step 9: Pattern Spotting Year 3 Addition and Subtraction Learning Video Clip

Ali is working in the Animal Conservation Park, but it seems that something is not right! Help her find out what it is.

More resources for Autumn Block 2 Step 9.

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Discussion points for teachers

1. Write a calculation in words to show this.
Discuss patterns that can be seen in the numbers. Discuss whether adding tens or ones affects the same columns every time.
643 + 2 = 645; 643 + 20 = 663; 643 + 200 = 843

2. Help Dot and Stan to work out how many ants are left by completing the calculation in words.
Discuss the existing pattern between the different tanks and how to complete the calculation.
Various answers, for example: 1g, 10g and 100g; 5g, 50g and 500g.

3. Write a calculation to show how many leaves Dot has eaten. Discuss how many leaves there were to begin with.
Discuss how many leaves Dot has eaten. Discuss how many leaves are left. Discuss how we would show this in a calculation.
3ml and 365ml

4. Write a new calculation to show how many ferns Dot and Stan have eaten altogether.
Discuss the different numbers that can be used to complete this question. If there is a pattern, where is it? This question is open-ended for the children to explore.
Various answers, for example: 249 + 1 + 9 = 259; 249 + 10 + 90 = 349

5. Write a subtraction calculation to show which groups of stones they could have taken away.
Discuss whether the pattern given is displayed conventionally. Why might this be?
Various answers, for example:

Optional discussion points:
Why is using patterns in numbers beneficial with larger numbers? Is there one way to work out calculations that is always better than another?

National Curriculum Objectives

Mathematics Year 3: (3C1) Add and subtract numbers mentally, including three-digit number and ones; three-digit number and tens; three-digit number and hundreds

Mathematics Year 3: (3C4) Solve problems, including missing number problems, using number facts, place value, and more complex addition and subtraction

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