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Maths Resources & WorksheetsYear 4 Maths LessonsAutumn Block 2 (Addition and Subtraction)10 Checking Strategies › Checking Strategies Year 4 Addition and Subtraction Learning Video Clip

# Checking Strategies Year 4 Addition and Subtraction Learning Video Clip

## Step 10: Checking Strategies Year 4 Addition and Subtraction Learning Video Clip

Sebastian the explorer is getting ready to leave the jungle and return home. Before he goes, he needs to make sure that all the data he has collected during his trip is accurate by using his knowledge of checking strategies.

More resources for Autumn Block 2 Step 10.

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Discussion points for teachers

1. Help Sebastian use the inverse method for each calculation to check they are correct. Discuss what the inverse is. Discuss the order of numbers when using the inverse.
8,085 – 2,804 = 5,281; 647 + 812 = 1,459; 2,138 + 3,426 = 5,609;
3,348 – 2,549 = 799
2. If any are incorrect, what should they be? Discuss what has gone wrong in the calculations. Discuss what the correct answers should be.
1,458 – 812 = 646; 2,549 + 789 = 3,338
3. What could the possible missing values be? Discuss the different combinations that can be made to create the answer. Discuss the most efficient way to do this. Discuss how to ensure numbers are not repeated. This question is open-ended for the children to explore.