Si Si’s 25 math questions

Single Variable

100

7-x=3

x=?

x=4

7-4=3

200

x+48=102

x=?

x=54

54+48=102

300

16x=80

x=?

x=5

16x5=80

400

x+7x=200

x=?

x=25

25+(7x25)=200

500

(x-10)+3x=50

x=?

x=15

(15-10)+(3x15)=50

Multiple Variable

100

x+y=24

y=13

x=?

x=11

11+13=24

200

x=57+y-z

x=70

z=14

y=?

y=27

70=57+27-14

300

75:x+y=39

y=14

x=?

x=3

75:3+14=39

400

x+3(y+z)=45

x=12

y=5

z=?

z=6

12+3(5+6)=45

500

2(a-b)+(c-5)+b=11

a=5

b=3

c=?

c=9

2x(5-3)+(9-5)+3=11

BEDMAS

100

3+4x2=?

3+4x2=11

4x2=8

3+8=11

200

56+72x11=?

56+72x11=848

72x11=792

56+792=848

300

2x(45+30)+19=?

2x(45+30)+19=169

45+30=75

2x75=150

150+19=169

400

3+7x6x(4:2)=?

3+7x6x(4:2)=87

4:2=2

7x6=42

42x2=84

3+84=87

500

101-(35:(4+3)+8x7)-3x8=?

101-(35:(4+3)+8x7)-3x8=16

4+3=7

35:7=5

8x7=56

5+56=61

3x8=24

101-61=40

40-24=16

Word Problems

100

^{If I inhale and exhale 11 000 liters of air in 24 hours, how many liters of air do I inhale and exhale in a week?}

11 000x7=77 000

I inhale and exhale 77 000 liters of air in a week.

200

I have 4 math homework due tomorrow and some Social Studies. If each homework takes me 50 minutes to complete, I would need 450 minutes. How many Social Studies homework are due tomorrow?

(450:50)-4=5

5 Social Studies homework are due tomorrow.

300

I receive 8 worksheets in a day to complete but not on Saturday or Sunday. How many worksheets do I have to complete in 3 weeks?

(8x5)x3=120

I will have to complete 120 worksheets in 3 weeks.

400

Mr. Nick sends me 11 worksheets a day for 4 days a week, 6 worksheets on the fifth day and nothing for the weekend. But my parents are giving me a task every Tuesday, Thursday and during the weekend. How many task and worksheets do a have to complete 2 weeks?

(11x4)+(6+4)x2=108

I will have to complete 108 tasks and worksheets in 2 weeks.

500

I complete some worksheets daily and it takes 20% battery to do a worksheet. I do 5 worksheets for every day of the week that starts with the letter M, 6 for every day that starts with T, 7 for every day that starts with W, 8 for every day that starts with F and 4 for every day that starts with S. How many times do I have to charge my ipad in a week if the only time i use battery is when I do the worksheets?

(5+(6x2)+7+8+(4x2)=40

40x20=800

800:(100-20)=10

I’ll have to charge my ipad 10 times in a week.

Vocabulary

100

What is the difference between a single variable equation and a multiple variables equation?

A single variable equation is an equation with 1 variable used and multiple variables equation have more than 1 variables used.

200

What does A stand for in BEDMAS?

The A stands for addition.

300

What does the x represent in a math equation?

The x can represent a number or an unknown value.

400

What does BEDMAS stand for?

Brackets, Exponents, Division, Multiplication, Addition, Subtraction.

500

7³; 3²

What are the little things called?

They are called exponents. 7³ is the same as 7x7x7