Notes

Remember that:

Any time a number smaller than (LESS than) 0 is added to a number larger than (GREATER than) 0 you would use subtraction as shown below:

   5+(-3)=5-3, therefore 5+(-3)=2

Any number subtracted from itself always equals 0.

Any number above 9 will always have more than one digit.

The number line is very important in calculating numbers smaller than 0.

Part I Test

Part 1 of 3.

1

${\displaystyle 2+2=}$

2

${\displaystyle 2+4=}$

3

${\displaystyle 5+3=}$

Part 2 of 3. Numbers greater than 9

4

${\displaystyle 10+11=}$

5

${\displaystyle 12+12=}$

6

${\displaystyle 14+10=}$

Part 3 of 3. Numbers smaller than 0

7

${\displaystyle -4-4=}$

8

${\displaystyle -2+5=}$

9

${\displaystyle 5-(-2)=}$

BONUS

10

${\displaystyle 4\times 5=}$