This week my numeracy group have been learning how to work out multiplication by rounding it to a tidy number here is some of what we did. I thought this was fun.

Exercise 1

What to do

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

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

- If 9 × 20 = 180 what is 9 × 22 ? 198
- If 7 × 30 = 210 what is 7 × 32 ? 224
- If 5 × 40 = 200 what is 5 × 43 ? 215
- If 4 × 50 = 200 what is 4 × 51 ? 204
- If 3 × 60 = 180 what is 3 × 61 ? 183
- If 6 × 70 = 420 what is 6 × 73 ? 438
- 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.

- If 9 × 20 = 180 what is 9 × 18 ? 172
- If 7 × 40 = 280 what is 7 × 37 ? 259
- If 5 × 40 = 200 what is 5 × 38 ? 190
- If 4 × 50 = 200 what is 4 × 47 ? 188
- If 3 × 60 = 180 what is 3 × 56 ? 168
- If 6 × 70 = 420 what is 6 × 67 ? 408
- If 6 × 80 = 480 what is 6 × 78 ? 168

8) If 8 × 90 = 720 what is 8 × 88 ? 104

In my literacy group we have been learning about the water cycle and we have been reading a book called water worriers.

Here are some of my silly sentences\Word work that I have been working on for this week.

Hi marshmallow I really like your blog you must be really good at maths.

ReplyDelete