Algebra with Whole Numbers

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Presentation transcript:

Algebra with Whole Numbers Working backwards

Working backwards

Find the number I think of a number I halve it. I add 4. The result is 7 Double 3 = 6 Subtract 4 = 3

Find the number I think of a number I add 3. I double it. The result is 12 Subtract 3 = 3 Halve 12 = 6

Find the number I think of a number I divide by 3. I add 4. The result is 6. Multiply by 3 = 6 subtract 4 = 2

Find the number Think of a number Multiply by 3. Add 15. Divide by 3. Subtract the original number. The result is 5. n 3n 3n + 15 n + 5 5

Solve for n. 10

Solve for n. 15

Solve for n. 5

Solve for n. 19

Solve for n. 10

13

3 15 21 7 3

2 3 1 2 6

3

8

12

3