KCF
What does KCF stand for?
3 x 4 =
12
20 ÷ 4 =
5
3/4 x 2/5 =
6/20
Reduced: 3/10
6/7 ÷ 3/4 =
24/21
Reduced: 8/7
Name the four operations that we have learned.
Addition, Subtraction, Multiplication, Division
What is the first step?
Keep the left fraction the same.
8 x 9 =
72
100 ÷ 10 =
10
5 x 2/9 =
10/9
-6 ÷ 5/10 =
-12
Name an example in the real world where you see fractions.
Answers may vary.
What is the second step?
Change the division sign to multiplication (x)
6 x (-3) =
-18
-81 ÷ 9 =
-9
4/7 x -7
-4
12/5 ÷ 7/11
132/35
What does the reciprocal mean?
Flip, inverse, upside down, etc.
What is the third step?
Flip the second fraction to its reciprocal
(-9) x (-4)
30 ÷ (-5) =
-6
- 7/6 x -4/3 =
28/18
Reduced: 14/9
5/3 ÷ 5/6 =
2
T/F: When given, 3/4 x 8/9, we flip the second fraction before we multiply.
FALSE! We do not flip any fractions when multiplying. Make sure you multiply straight across.
Multiply numerators by numerators and denominators by denominators
(-10)(5) =
-50
-32 ÷ -8 =
4
12/15 * (-8/9)
-96/135
Reduced: 32/45
(-3/4) ÷ (-2/3) =
9/8
Complete this...
Positive x Postive = ?
Positive x Negative = ?
Negative x Postive = ?
Negative x Negative = ?
+
-
-
+
What is the fifth step?
Simplify/Reduce, if needed
1000000 x 0 =
0!
-21 ÷ 0 =
0!
(9/2)(-3/10) =
-27/20
(-8/3) ÷ 9/7 =
-56/27
Solve the mystery puzzle! (DOUBLE POINTS!)
Vampire x Cat = 20
Pumpkin = Cat x Cat
4 = Pumpkin ÷ Cat
Cat x Vampire x Pumpkin = ?
320!
Vampire = 5
Cat = 4
Pumpkin = 16