Download If you subtract a negative number from a negative

Name: _____________________
Due:
Year 7
HOMEWORK 6 – Using negative numbers in real life contexts
Answer all questions to the best of your ability. Don’t forget to come to Maths Clinic
(Monday, Tuesday, Thursday & Friday in IT04 from 12:30-13:00) if you need some help!
Please answer questions on the sheet. Do not use your calculator unless specified.
Make sure you show your working!
Example
The temperature in Venice is 11˚C.
The temperature in London is -2˚C.
What is the difference in temperature?
11 + (-2) = 13˚C
Question 1
Put these temperatures in order from coldest to
warmest.
Copenhagen 6˚C
Berlin -3˚C
Reykjavik -12˚C
Madrid 0˚C
London -0.5˚C
What is the difference in temperature between:
a) Reykjavik and Berlin ____
b) Copenhagen and London ____
Question 2
Complete these pairs of calculations.
2+
=6
-5 +
=3
2-
=6
-5 -
=3
+9=6
8+
= -12
- (-9) = 6
8-
= -12
Question 3
Which of these statements are ALWAYS, SOMETIMES and NEVER true.
ALWAYS TRUE
(-2) – (-4)
If you subtract a negative number
from a negative number you get a
positive answer.
SOMETIMES TRUE
Adding a negative gives the same
result as subtracting a positive
4 + (-9) = 4 – (+9)
(-3) + (-7)
NEVER TRUE
If you add two negative numbers,
you get a positive answer
Name: _________________________________________________
Initials: ______
Date: _________
 You can demonstrate your understanding of directed numbers in a diagram
WWW
What went
well
 You can calculate the answers to questions involving addition and subtraction
of positive and negative numbers
Revise: what happens when you add a negative, or subtract a positive
Try: drawing diagrams to represent the question you are trying to answer
Try: using a number line to visualise negative and positive numbers
Make sure that you: check your working / show your working out / include any units
Use: MyMaths.co.uk or come to Maths Clinic (Mon, Tues, Thurs & Fri lunchtime – IT04).
Please complete:
NYM
Now you must
a) Write a calculation for which this statement is true:
If you subtract a negative number from a negative number you
get a positive answer.
b) Write a calculation for which this statement is true:
If you subtract a negative number from a negative number you
get a negative answer.
AT
Action taken
Mark Scheme
Print homeworks in this format. Use one A4 sheet per homework:
Homework
page 1
Homework
page 2
and on the reverse
Question 1
Coldest
Reykjavik -12˚C
Berlin - 3˚C
London -0.5˚C
Madrid 0˚C
Copenhagen 6˚C
Warmest
Difference between:
Reykjavik and Berlin: 9˚C (not -9˚C)
Copenhagen and London: 6.5˚C
Question 2
2 + +4 = 6
2 - -4 = 6
-5 + +8 = 3
- 5 - -8 = 3
-3 + 9 = 6
- 3 – (-9) = 6
8 + -20 = -12
8 - +20 = - 12
Blank page
for sticking
into book
Assessment
sticker page,
which when
folded will
form front of
booklet
Question 3
(-2) – (-4)
ALWAYS TRUE
If you subtract a negative number
from a negative number you get a
positive answer.
SOMETIMES TRUE
Adding a negative gives the same
result as subtracting a positive
4 + (-9) = 4 – (+9)
(-3) + (-7)
NEVER TRUE
If you add two negative numbers,
you get a positive answer
Challenge question (from assessment sticker)
a) Write a calculation for which this statement is true:
If you subtract a negative number from a negative number you get a positive
answer.
For example: -3 – (-5) = + 2
b) Write a calculation for which this statement is true:
If you subtract a negative number from a negative number you get a
negative answer.
For example: -3 – (-1) = - 2