W8 Reflection

Exercise 5

What to do   

Use the information given to you to derive the answer to a similar problem.

1. If 4 × 200 = 800 what is 4 × 201 ? 804
2. If 7 × 300 = 2100 what is 7 × 301 ? 2107
3. If 8 × 400 = 3200 what is 8 × 402 ? 3216
4. If 9 × 500 = 4500 what is 9 × 501 ? 4509
5. If 5 × 600 = 3000 what is 5 × 602? 3010
6. If 3 × 700 = 2100 what is 3 × 704 ? 2112
7. If 2 × 800 = 1600 what is 2 × 803 ? 1606

8) If 6 × 900 = 5400 what is 6 × 903 ? 5418

Exercise 6

What to do   

Use the information given to you to derive the answer to a similar problem.

1. If 4 × 200 = 800 what is 4 × 199 ? 796
2. If 7 × 300 = 2100 what is 7 × 299 ? 2093
3. If 8 × 400 = 3200 what is 8 × 398 ? 3184
4. If 9 × 500 = 4500 what is 9 × 498 ? 4482
5. If 5 × 600 = 3000 what is 5 × 597 ? 2985
6. If 3 × 700 = 2100 what is 3 × 698 ? 2094
7. If 2 × 800 = 1600 what is 2 x 797 ? 1585
8. If 6 × 900 = 5400 what is 6 × 897 ? 5382

Exercise 7

What to do   

Use the information given to you to derive the answer to a similar problem.

1. If 2 × 25 = 50 what is 2 × 24 ? 48
2. If 4 × 25 = 100 what is 4 × 27 ? 112
3. If 3 × 15 = 45 what is 3 × 14 ? 42
4. If 4 × 15 = 60 what is 4 × 17 ? 58
5. If 6 × 15 = 90 what is 6 × 14 ? 84
6. If 2 × 25 = 50 what is 2 × 26 ? 52
7. If 4 × 25 = 100 what is 4 × 24 ? 72
8. If 3 × 15 = 45 what is 3 × 16 ? 48
9. If 4 × 15 = 60 what is 4 × 13 ? 52
10. If 6 × 15 = 90 what is 6 × 17 ? 102

Exercise 8

What to do   

Use the strategy add a little/subtract a little to solve these problems.  

Julie wanted to find 3 × 28.

She knows that 28 is near 30, so she used 3 × 30 = 90 and subtracted 3 × 2 = 6 to get the answer.  

Julie recorded this in her maths book

3 × 28 = 90 – 6 = 84

Using Julie’s method find the answer to the following problems.  Record your working like Julie did.

1) 4 × 19 76 (2) 3 × 41 123                    (3) 5 × 59 295

4) 7 × 52 364 (5) 4 × 73 308                   (6) 3 × 37 111

7) 6 × 102 612 (8) 5 × 301 1505 (9) 4 × 698 2792

10) 3 × 499 1497 (11) 7 × 602 4214 (12) 9 × 3999 35991

I have been learning how to do big numbers Now I can do more hard work

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