Operation Rules
Which operation sign is often not shown?
xx
+(+ becomes
+
-(- becomes
+
When is Seesaw used? Add, subtract, multiply, or divide?
Add and Subtract
When is Sleepy Face used? Add, subtract, multiply, or divide?
Multiply and Divide
When doing long addition or long subtraction of numbers with decimal points, what do you line up?
decimal points
-(+ becomes
-
2-(-3)=
5
When doing -5+3, what number should be written on the negative side of Seesaw?
5
When doing -4 x -2, how do you use Sleepy Face to determine the sign of the final answer? What is the sign of the final answer?
Cover the two negative signs, and the final answer is positive
When doing long multiplication of numbers with decimal points, what do you line up?
the last digits
+(- becomes
-
-1-(-2)=
1
When doing -8-2, that 2 should be written on the positive side or the negative side? Why?
negative side, because the sign in front of 2 is -
When doing 6 x -3, how do you use Sleepy Face to determine the sign of the final answer? What is the sign of the final answer?
Cover the positive sign and one of the negative signs, and the final answer is negative
When doing long multiplication of numbers with decimal points, how do you determine the position of the decimal point of the final answer?
count totally how many numbers after decimal points
5+(-2)=
3
4-(-2)=
6
When doing -4-7, what number should be written on the negative side of Seesaw?
4 and 7
-12xx3=
-36
When doing long division, what can you use to determine which number goes inside of the division bracket?
In & Out
-1+(-2)=
-3
-4-(-2)=
-2
What operations allow you to use the sign of the bigger number to determine the sign of the final answer?
Addition and Subtraction
-115-:(-5)=
23