Thursday 24 March 2016

Week 8 reflection



Hi, this is some of my learning this week. I learnt how to add and subtract using doubling and halving. I found this strategy really helpful.


WALT :add or subtract multiplication questions

  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 ?    196
  6. If 2 × 70 = 140 what is 2 × 73 ?    146
  7. If 4 × 80 = 320 what is 4 × 82 ?    328
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 ?  171
2) If 8 × 30 = 240 what is 8 × 29 ?  232   
3) If 7 × 40 = 280 what is 7 × 39 ?  273
4) If 5 × 50 = 250 what is 5 × 49 ?  245
5) If 3 × 60 = 180 what is 3 × 58 ?  174
6) If 2 × 70 = 140 what is 2 × 67 ?  134
7) If 4 × 80 = 320 what is 4 × 78 ?  312   
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 ?  198
  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 ?  172
  2. If 7 × 40 = 280 what is 7 × 37 ?  260
  3. If 5 × 40 = 200 what is 5 × 38 ?  190  
  4. If 4 × 50 = 200 what is 4 × 47 ?  198
  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 ?  466
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 ?  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 ?  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 ?  43
  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 × 41=123                  (3) 5 × 59=295
4) 7 × 52 =364     (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=35,991



These are my silly sentences for Word Work this week.  I have used my spelling words this week to write some funny sentences.

Writing

We were given this picture to write about. Here are my answers.  I learnt there are many types of storms in the world.



  1. Have you ever been caught in a storm? What was it like?
  2. Are storms the same all over the world, or are the different?
  3. What causes a storm?
  4. What do you think are the most dangerous things  of a storm?
  5. How can people avoid these dangers?
  6. Do mountains play a part when storms build?
  7. Can you think of other occasions when weather can be dangerous?
  8. What is your favourite type of weather?
  9. If you could live anywhere in the world where would it be
    1. I was up at MT Cheeseman Sking and All this strong ,hard bits of snow it was scary
    2. I reckon no
    3. Nature
    4. Rain ,hail,ice,snow
    5. Stay at home and brace yourself
    6. no
    7. Snow
    8. New Zealand
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