# Year 7 Whole Numbers Addition Teaching Presentation

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. com © 2023.Y7 WHOLE NUMBERSAdditionLearning Intention:We are learning how to calculate the sum of large whole numbers, using algorithms. (Tāpiritanga)

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. com © 2023The following are mental maths problems. You may not use any paper. You may only work these out in your head.

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. com © 2023The following are mental maths problems. You may not use any paper. You may only work these out in your head.

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. com © 2023Discuss with a partner:Explain your strategy for adding numbers mentally.Compare your addition strategy with some of your classmates’ strategies.What is similar about your strategies? Different?

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. com © 2023When doing mental addition, it is often easiest to count up until you reach a multiple of 10.We can partition or split, one of the numbers to make a multiple of 10 with the other.For example:9 + 15 --> 4 + 20 = 2427 + 38 --> 25 + 40 = 65Remember, the place values are:

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. com © 2023Can we add the digits in the ones place and tens place? Why?Can we add the digits in the ten millions and ten thousands place? Why?

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. com © 2023Extension: What digits are missing? Work backwards!

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. com © 2023Extension: What digits are missing? Work backwards!

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. com © 2023 I can add two numbers (up to 4-digits). I can add three numbers (up to 4-digits).

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. com © 2023Each hexagon is made by adding the numbers in the two hexagons below it (above for the bottom puzzle). Fill in the missing numbers in these puzzles.

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. com © 2023Each hexagon is made by adding the numbers in the two hexagons below it (above for the bottom puzzle). Fill in the missing numbers in these puzzles.

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. com © 2023• Did you meet your Success Criteria? Yes / No•What is one big thing you learnt today?•Where can you use this knowledge again?