MATH IN MY WORLD key 3

Các bài tập khuyến khích thực hiện trong tiết dạy Math in My World 3 Back to school... Write the number and read a.. They go to school about 10 minutes.. It takes 11 hours to travel arou

i n M y W o r ld

NGUYỄN TRƯỜNG GIANG

LÊ VĨNH PHÚC

80 : 8 = ?

3 x 10 = ?

25 : 5 = ?

Answer key

Các bài tập khuyến khích thực hiện trong tiết dạy

Math in My World 3 Back to school Bài 1, 2a, 3a, 4, 5 cột 1, 6 cột 1, bài 7

Bài Let’s practice Let’s try Math in My World

Unit 1 Bài 1 – ba dòng đầuBài 2 b, c Bài 1 – ba dòng đầuBài 2 b, c, d Hai câu đầu

Unit 2 Ba phép tính đầu Bài 1 a, bBài 2 Nếu còn thời gian

Unit 3 Ba phép tính đầu (876, 297, 336) Bài 1 – ba số đầuBài 2 Nếu còn thời gian

Unit 4 Bài 1 Bài 1Bài 3 – hai dòng cuối Nếu còn thời gian

Review 1 Bài 1, 2, 3Bài 4 a, b

Bài 7

Unit 5 Câu 4, 5, 6, 7 Bài 1, Bài 2 a, bBài 3 a, b Nếu còn thời gian Unit 6 Bốn đồng hồ đầu Bài 2 – ba đồng hồ đầu Nếu còn thời gian Unit 7 Bài 1, 2 Bài 1 – ba hình đầuBài 2 a Nếu còn thời gian

Review 2 Bài 1, 2, 3

Unit 9 Bài 1 b, cBài 2 b, c, d Bài 1 a, b, c, dBài 2 Nếu còn thời gian

Review 3 Bài 2, 3, 4

Unit 12 Câu 2, 3 Bài 1 b, c, dBài 2 Nếu còn thời gian

Unit 13 Match B, C, D, E Bài 1 – ba phép tính đầuBài 2 – hai phép tính đầu Nếu còn thời gian

1 b 57 = 50 + 7

2 a 13, 38, 42, 67, 80

b 77, 55, 46, 23, 19

3 a 7 + 2 = 9

b 9 + 5 = 14

4 triangle, circle, square, rectangle

5 Find the sum: 45, 49, 82

6 Find the difference: 34, 41, 38

7 Linh has 33 cherries left.

8 There are 44 students in his class.

Let’s practice

1 Read and match

306 three hundred six 128 one hundred twenty-eight

765 seven hundred sixty-five 183 one hundred eighty-three

450 four hundred fifty 809 eight hundred nine

2 Place the value of the digit in these numbers

Let’s try

1 Fill in the box: >, <, >, =

2 Write the number and read

a 209 two hundred nine b 415 four hundred fifteen

c 909 nine hundred nine d 112 one hundred twelve

e 380 three hundred eighty f 862 eight hundred sixty-two

g 540 five hundred forty h 606 six hundred six

Math in my world

101 one hundred one

153 one hundred fifty-three

666 six hundred sixty-six

Unit 1

Let’s practice

Add then circle the right sum

142 + 209 = 351 156 + 126 = 282 137 + 134 = 271

248 + 205 = 453 238 + 259 = 497 319 + 326 = 645

Let’s try

1 Find x x – 135 = 249 x – 289 = 130

x = 249 + 135 x = 130 + 289

x – 104 = 219 x – 215 = 292

x = 219 + 104 x = 292 + 215

2 120 + 386 = 506

The pig and the tiger are 506 kg all together

3 386 + 120 = 506

Nam has 506 stickers

Math in my world

570 + 32 = 602 kg

602 > 600 So Lan can not get into the elevator

Unit 2

Let’s practice

Subtract Put the ball whose difference is an even number into the basket

876 - 669 = 207 297 - 188 = 109 336 - 119 = 217

443 - 295 = 148 525 - 306 = 219 977 - 649 = 328

Let’s try

1 Rule: subtract 314

664 - 314 = 350 865 - 314 = 551 642 - 314 = 328

796 - 314 = 482 687 - 314 = 373 772 - 314 = 438

2 264 - 38 = 226

Huy has 226 marbles

Math in my world

448 – 52 = 396

The library has 396 books at first

Unit 3

Let’s practice

1 9 + 2 = 11

Trung has 11 pencils

9 + 11 = 20

They have 20 pencils in all

8 + 3 = 11

Huan gave his friend and his teacher 11 colored pencils

30 – 11 = 19

Huan had 19 colored pencils left

2 8 + 3 = 11

Huan gave his friend and his teacher 11 colored pencils

30 – 11 = 19

Huan had 19 colored pencils left

Let’s try

1 130 – 118 = 12

The greengrocer packed 12 more apples than bananas

130 + 118 = 248

The greengrocer packed 248 pieces of fruit in all

2 143 – 25 = 118

Nam read 118 pages

143 + 118 = 261

They read 261 pages in all

>, <, =, >

Unit 4

Math in my world

7 + 3 – 2 = 8

Lan had 8 dresses at last

8 + 1 = 9

Vy had 9 dresses

Review 1

1.

Number Hundreds Tens Ones

8 63 8 6 3

2 Lan: 900 Nam: 389 Trung: 965 Vy: 845

3 duckling: 524 puppy: 552 kitty: 170 pony: 414

4 a x = 652 c x = 137

b x = 303 d x = 238

5 385 – 175 = 210 Rule: - 175

6 100 + 85 = 185 Rule: + 85

7 62 – 42 - 5 = 15

There were 15 parents (on the school trip)

Let’s practice

1 two seconds

2 five hours

3 two weeks (months, days)

4 five minutes

5 three hours

6 forty-five minutes

7 five days a week

Let’s try

1 a They go to school about 10 minutes.

b She studies about 35 minutes

c He plays football about 2 hours

2 a It takes 2 hours to watch a play.

b It takes 4 months to write a book

c It takes 11 hours to travel around Ho Chi Minh City

d It takes 6 years for a pearl to form inside the oyster

3 a It takes 2 minutes to brush my teeth.

b It takes 3 hours to cook a meal

c It takes 2 months to lose weight

d It takes 2 hours to draw a beautiful picture

Math in my world

Unit 5

Let’s practice

Unit 6

Let’s practice

1 a 3 – 2 – 1

b 2 – 1 – 3

2 L – mL – mL – mL

Let’s try

1 more than, less than, more than, more than, less than

2 a =

b <

Math in my world

Four 500 mL bottles equal 2 L

Unit 7

Let’s practice

1 a g b g c kg d g

2 b 20 g b 150 g c 200 kg d 200 g

Let’s try

1 a 1 – 2 – 3 b 3 – 2 – 1 c 3 – 1 – 2

Math in my world

Guess: 60 kg

I gain weight because I eat candies, fried chicken, no doing exercise…

I should eat fish, vegetables, fruit…

Review 2

1 a 3 – 2 – 1 b 2 – 1 – 3 c 3 – 2 – 1

2 b 3 g c 80 kg d 120 kg

3 8:15

Unit 8

Let’s practice

1 b 5 x 3 c 3 x 6

2 b 3 + 3 + 3 + 3 + 3 c 5 + 5

d 10 + 10 + 10 e 8

g 4 + 4 + 4 + 4 + 4 h 3 + 3 + 3

Let’s try

1 a 3 x 2 2 x 3 b 5 x 3 3 x 5

c 4 x 2 2 x 4 d 2 x 2

e 2 x 5 5 x 2 f 3 x 3

g 4 x 5 5 x 4 h 4 x 4

2 3 x 4 = 12

She saw 12 butterflies

3 5 x 3 = 15

They found 15 ladybirds

Math in my world

2 – 6 4 – 3 3 – 4 1 – 12

Unit 9

Let’s practice

1 A week has 7 days 3 x 7 = 21 She buys 21 sunflowers in a week.

2 A kitty has 4 legs 4 x 8 = 32 Eight kitties have 32 legs.

3 A car has 4 wheels 4 x 7 = 28 Seven cars have 28 wheels.

4 Each of them picked 9 apples 9 x 2 = 18 They picked 18 apples in all.

Let’s try

1 Minh has 9 pens 9 x 3 = 27 Bao has 27 pens 27 – 9 = 18 Bao has 18 more pens

than Minh

2 9 x 4 = 36 Lan gave 36 stickers to her friends 36 + 87 = 123 Lan had 123 stickers

at first

Math in my world

3 x 3 x 3 = 27 cubes

Review 3

4 Two pairs of wings are 4 wings 3 x 4 = 12 wings.

5 3 x 5 = 15 There are 15 strawberries in all.

6 10 x 5 = 50 There are 50 girls 10 + 50 = 60 There are 60 children at the library.

Unit 10

Let’s try

2 36 : 4 = 9 There were 9 muffins in each box.

3 24 : 3 = 8 There are 8 fish tanks.

Unit 11

Let’s practice

2 Check 8 x 2 + 5 = 21

3 Check 3 x 4 + 3 = 15

4 Check 1 x 9 + 4 = 13

Let’s try

2 Each person bought 3 stamps 3 x 4 = 12 They bought 12 stamps 12 + 3 = 15

Hoa had 15 stamps at first

Math in my world

I think each group should has 4 people So there are 10 groups There is 1 person left A group will have 5 people

Unit 12

Unit 13

Math in my world

3 x 6 = 18

There are 18 colored pencils 18 : 9 = 2 She gave 2 colored pencils to each person

Review 4

3 30 : 5 = 6

Trung ate 6 cherries

4 20 : 4 = 5

There are 5 tigers in the zoo