Bài tập toán cơ bản số 21

Created by T. Madas
Question 1
Evaluate the following giving the final answer in its simplest form without using mixed numbers.

1.

2+ 3 = 7
5 10 10

2−4= 2
3 9 9

4×3 = 1
3 8 2

4 ÷ 3 = 28
5 7 15

2.

1+ 7 =6
2 10 5

2− 1 = 7
3 12 12

3×8 = 2
4 9 3

3 ÷ 5 = 18
2 12 5

3.

2 + 3 = 19
3 5 15

5 − 3 = 11
6 8 24

5×1 = 5
4 8 32

2ữ5 = 4
3 6 5

4.

3+2
4 3

= 17
12

79
3 4

3 16
8ì 3

=2

3
1
20 ữ 40

5.

5+3
3 4

29
= 12

5 5
8 12

15 ì 8
4 5

=6

3 6
10 ữ 5

= 14

6.

1+ 3
2 16

5ì 7
3 15

= 97

2 11
7 ữ 14

4
= 11

7.

5+3
3 8

8.

3 ì 34 = 94

11
= 16

= 49
24

9−3
4 7

1
= 12
5
= 24
51
= 28

2 1
9 − 10

11
= 90

5 × 6 = 15
4
2

18 ì 7
5 12

21
= 10

7 ữ2 = 7
6
12

12 ÷ 12
5
7

=6

= 75

5
6 ÷ 12
5 =2

Question 2
Evaluate the following giving the final answer in its simplest form using mixed numbers where
appropriate.

1.

12 + 7 = 3 5
3 4
12

11 + 3 5 = 5 1
4
6
12

11 + 2 5 = 4 1
3
6
6

11 +1 3 = 3 1

2 4
4

2.

3 1 −1 3 = 1 3
2 4
4

2 14 − 1 83 = 78

1 =1
1 35 − 110
2

7
2 13 − 1 34 = 12

3.

39 = 1 7
1 85 × 43 = 32
32

1 ×21
4
3

3 = 63
2 85 × 16

128

1
3 × 2 57 = 57
7 =87

4.

1
1 56 × 3 = 11
2 =52

1
2 95 ÷ 23
3 =3

77 = 6 5
1 56 ì 3 12 = 12
12

1 23 ữ 3 = 95

5.

3 ÷ 15 = 32 = 2 2
113
26 15
15

2 73 ữ 3 12 = 34

49

4
1
9 ì23

2 25 ữ 4 = 53

7
= 12

4
= 21

Created by T. Madas


Created by T. Madas
Question 3
Evaluate the following giving the final answer in its simplest form.

1.

2.

3.

4.

5.

=4
3

3
4 = 3

3

4

4

16

2
3 =4
1
6

2

1
2 =3
×
1 4 4
3

1
2

1
4

1
3
− 14 =
2 2

3
5 ÷7 = 4
7
2
10 3 49

3

2 + 34

11
=
2 − 34 5

1+3
2 4
5 − 14

1+1
2 3 =2
1+1
4 6

1+3
2 4
1−2
2 5

1+
2
3
4+

3+1
4 2
1 − 43 × 12

1 + 12 × 53

1 + 1ì3
2 2 5 =6
3ì2 1
4 5 6

3

2
3
4
5

70

=
93

3 ữ 15
113
26

=

2 73 ữ 3 12

5
19

=2

3+2+ 3
4 5 20
4
1
9 ì23

Created by T. Madas

1
2 = 37
+
1 3
6
2

=1

1
6 × 10 = 15
×
3
2
2
9 5 5

=

2 25 ÷ 4

25
2