# Integers + subtracting - examples

1. Unknown x
If we add to unknown number 21, then divide by 6 and then subtract 51, we get back an unknown number. What is this unknown number?
2. Mistake
Nicol mistake when calculate in school. Instead of add number 20 subtract it. What is the difference between the result and the right result?
3. Opposite numbers
Calculate opposite numbers (additive inverse) to given ones:
4. Thermometer
The thermometer showed -3°C at morning. Then temperature was increased by 1°C again increased by 1°C and then decreased by 1°C and then decreased by 4°C. Which terminal temperature thermometer shows?
5. Integers
May be the sum of two integers less than their difference?
6. Numbers
Find number on thenumber line that has same distance from this numbers:
7. With bracket
Calculate (evaluate) simple mathematical expression with a negative numbers and a bracket: 13+15*5-2*(-6)
8. Freezer
Temperature is -8 degrees Celsius in the freezer. Outside temperature is 2 degrees Celsius. One minute took to change temperature by one degree Celsius if we open door. How many minutes the temperature in the freezer will rise?
9. Expression 6
Evaluate expression: -6-2(4-8)-9
10. Brackets 2
Add parenthesis to make true: 5-2×6-4+2=5
11. Degrees 2
The temperature was 3°F and falls four degrees Fahrenheit. What is actually temperature?
12. The temperature
The temperature at 1:00 was 10 F. Between 1:00 and 2:00, the temperature dropped 15F. Between 2:00 and 3:00, the temperature rose 3F. What is the temperature at 3:00?