Unit 3. Decimals
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•
Mathematics, English
•
8th Grade
•
Medium
MARÍA LORENZO
Used 8+ times
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5 Slides • 14 Questions
1
by MARÍA LORENZO
2
When do we use them?
3
Multiple Choice
Which of these numbers is the lowest?
0.425
0.252
0.415
0.465
4
Multiple Choice
Which of these numbers is the highest?
0.425
0.252
0.415
0.465
5
Multiple Choice
How many decimals numbers are between 1 and 2?
Infinites
(infinitos)
Just one, the 1.5
(Sólo uno y es el 1.5)
Ten numbers:
1,1 1,2 1,3 1,4....
None
(ninguno)
6
Round off = redondeo
Examples:
6,22336 = 6,2234
6,22336 = 6,223
6,22336 = 6,22
7,5648 = 7,565
7,5648 = 7,56
7,5648 = 7,6
7
To add and subtract decimal numbers, we put them in a column matching the corresponding decimal places.
8
Multiple Choice
Calculate:
1,8 + 2,1
1,5
10,2
3,9
9
Multiple Choice
Calculate:
2,25 + 3,6
2,61
5,85
5,25
10
Multiple Choice
Calculate:
1,25 + 2 + 1,40
4,65
3,40
3,25
2,67
11
Multiple Choice
Calculate:
4,21 - 3,72
1,51
0.49
7,93
12
Multiple Choice
Calculate:
5 - 3.81 =
1,81
8,81
1,19
13
Multiple Choice
Calculate:
(2,23 + 4,75) - 3,64 =
3,34
10,62
6,34
14
We multiply decimal numbers as if they are integers, then we separated in the product as many decimale places, as the sum of the decimal places of two factors.
15
Multiple Choice
Calculate:
2 · 3,24 =
5,24
6,48
3,48
16
Multiple Choice
Calculate:
3,21 · 2,1 =
5,31
1,11
67,41
6,741
17
Multiple Choice
Calculate:
4,25 · 1,72 =
7,31
5,97
2,53
18
Multiple Choice
I went shopping with 30 €, but I spent 12,50 € in a book and 7,55 € in a box of chocolates. How much money did I spend?
30
12,5
7,55
20,05
19
Multiple Choice
I went shopping with 30 €, but I spent 20,05 €. How much money did I have at the end of the day?
30
9,95
9,05
20,05
by MARÍA LORENZO
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