Slideshow 4 Mr Richard Sasaki Room 307 Adding and Subtracting Positive and Negative Numbers.

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Presentation transcript:

Slideshow 4 Mr Richard Sasaki Room 307 Adding and Subtracting Positive and Negative Numbers

Objectives Use the number line to add and subtract (by counting)Use the number line to add and subtract (by counting) Learn (or review) how to add or subtract from negative numbersLearn (or review) how to add or subtract from negative numbers Learn (or review) how subtracting two positive numbers can make a negativeLearn (or review) how subtracting two positive numbers can make a negative Add and subtract negative numbersAdd and subtract negative numbers Please complete the vocabulary check. You have five minutes. Good luck!

Answers

Using the Number Line As you know (since you were like 6), you can count up and down the number line to add or subtract. +5 We start at 2, move 5 places right and end up at 7. For subtraction, we move left. -2 We start at 10, move 2 places left and end up at 8.

Negative Numbers The same applies for negative values. -5 We start at 2, move 5 places left and end up at We start at 9, move 2 places right and end up at -7.

Positive and Negative Numbers We do however, need to be able to calculate without the number line! Note: Visualise the number line and calculation however you wish!

Examples (Part 1) Let’s try a few examples! Calculate the following:

Examples (Part 2) Calculate the following:

Answers - Easy

Answers - Medium

Answers - Hard