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W8 Reflection

WALT: use decscriptive words

Numeracy

Exercise 1

What to do   

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

1. If 9 × 20 = 180 what is 9 × 21 189
2. If 8 × 30 = 240 what is 8 × 31 248
3. If 4 × 40 = 160 what is 4 × 42 168
4. If 5 × 50 = 250 what is 5 × 51 255
5. If 3 × 60 = 180 what is 3 x 62 186
6. If 2 × 70 = 140 what is 2 × 73 146
7. If 4 × 80 = 320 what is 4 × 82 320

8)    If 2 × 90 = 180 what is 2 × 94 188

Exercise 2

What to do   

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

1) If 9 × 20 = 180 what is 9 × 19 160

2) If 8 × 30 = 240 what is 8 × 29 210

3) If 7 × 40 = 280 what is 7 × 39 240

4) If 5 × 50 = 250 what is 5 × 49 245

5) If 3 × 60 = 180 what is 3 × 58 168

6) If 2 × 70 = 140 what is 2 × 67 134

7) If 4 × 80 = 320 what is 4 × 78 372

8) If 2 × 90 = 180 what is 2 × 86 172

Exercise 3

What to do   

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

1. If 9 × 20 = 180 what is 9 × 22 206
2. If 7 × 30 = 210 what is 7 × 32 224
3. If 5 × 40 = 200 what is 5 × 43 215
4. If 4 × 50 = 200 what is 4 × 51 204
5. If 3 × 60 = 180 what is 3 × 61 183
6. If 6 × 70 = 420 what is 6 × 73 438
7. If 6 × 80 = 480 what is 6 × 81 486

8)    If 8 × 90 = 720 what is 8 × 92 736

Exercise 4

What to do   

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

1. If 9 × 20 = 180 what is 9 × 18 162
2. If 7 × 40 = 280 what is 7 × 37 259
3. If 5 × 40 = 200 what is 5 × 38 190
4. If 4 × 50 = 200 what is 4 × 47 182
5. If 3 × 60 = 180 what is 3 × 56 168
6. If 6 × 70 = 420 what is 6 × 67 402
7. If 6 × 80 = 480 what is 6 × 78 468

8)    If 8 × 90 = 720 what is 8 × 88 704

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 1093
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 1594
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 × 27 108
3. If 3 × 15 = 45 what is 3 × 14 42
4. If 4 × 15 = 60 what is 4 × 17 68
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 96
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 × 41123 (3) 5 × 59 295

4) 7 × 52 134 (5) 4 × 73  292 (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

We learn't to use rounding compensation strategies.

Reading

WALT: comprehend what we read