Transcript Lesson 2.4

Bell Ringer #4
A submarine is cruising at a depth of 30m.
It climbs 12m, then dives 21m, and then
climbs 13m. At what depth is the
submarine?
Un submarino es de crucero a una
profundidad de 30 metros . Se sube a 12
metros , y luego se sumerge 21m , y luego
sube 13m . ¿A qué profundidad está el
submarino ?
2.4 Subtraction of Rational
Numbers
Subtraction Rule
• Subtracting is the same as
ADDING THE OPPOSITE!!!
• Add the numbers and keep
the sign of the bigger
number.
Subtract.
-3 – 4 =
Subtract.
-8 – (-5) =
Subtract.
-4 – (-6) =
Subtract without a number line.
2–6 =
Subtract without a number line.
4–9 =
Subtract without a number line.
6 – (-4) =
Subtract without a number line.
- 4 – 17 =
Subtract without a number line.
- 3 – (-12) =
Subtract without a number line.
- 86 – (-400) =
Subtract without a number line.
- 4.2 – (-3.6) =
Subtract without a number line.
1 5
  
3 3
Subtract without a number line.
1 3
 
2 4
Subtract without a number line.
3  1
 
8  4
Subtract without a number line.
4 – 5 + (-3) + 1=
Subtract without a number line.
- 6 – (-2) – (-4) – 12 + 3 =
Ticket Out the Door
3 – (-7.1) + 6.3 - (-5.2)=
Homework
• Pg. 74
• #’s 10 – 30 even
• #’s 39 - 42