Lesson 1 MATHS POWERPOINT222.pptxljhgghgg

A Maths PowerPoint used to explain about place value

1. Date Written Addition and Subtraction Starter 23852 + 7432 3685 x 7 87542 – 9423 7/10 + 7/10 325 x 100

2. Vocabulary Place Value – The value a digit has because of its position in a number Digit – Any of the numerals from 0 to 9 used to form numbers Place holder – A significant zero in the place value of a number Commutative – Where the answer is the same regardless of which order the operation is done in

3. 4 7 3 9 1 8 5 3 + What is important to remember when using written addition? Does it matter which way round the numbers are? Why/ why not?

4. 4 7 3 9 1 8 5 3 - What is important to remember when using written subtraction? Does it matter which way round the numbers are? Why/ why not?

5. Practice: 67483 + 9727 74639 - 42437 Remember to line up numbers accurately How could you make the second question more challenging?

6. Practice 2: 2846 + 38902 25862 - 9856 Remember to line up numbers accurately Which question is the same as finding the difference? How do you know?

7. Practice 3: 40000 - 27383 Remember to line up numbers accurately Is there a more efficient method for solving the question? If so, how?

8. Variation: Sarah is trying to solve the following question: 4657 + 29437 She gets the answer 76,007. Is she correct? If not, explain the mistake she has made. Complete the calculation to find the answer How could you work out whether Sarah is right or wrong most efficiently?

9. Activity