Disneyworld Los Angeles 86 F Devils Tower Wyoming 41 F Death Valley hottest place in the USA 113 F Who has been to Disneyworld in LA ID: 733624
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Slide1
Brianne and Rana are planning a trip to the United States. As part of their research, they have found out some midday temperatures at places they plan to visit:Disneyworld, Los Angeles 86 ˚FDevil’s Tower, Wyoming 41 ˚FDeath Valley, (hottest place in the USA) 113 ˚F
Who has been to Disneyworld in L.A.?Slide2
Disneyworld 86 ˚F Slide3
Death Valley, (hottest place in the USA) 113 ˚FSlide4
Devil’s Tower, Wyoming 41 ˚FSlide5
C
=
5
F
-160
9
What do the letters C and F mean in this formula? Explain what the term 5F means in this formula?Most formulas in algebra do not use the × symbol or the ÷ symbol. Explain how this formula shows division? Convert the three temperatures into degrees Celsius. Disneyworld, Los Angeles 86 ˚F Devil’s Tower, Wyoming 41 ˚F Death Valley, (hottest place in the USA) 113 ˚F Explain in words what this formula does. Why do you think we use algebra rather than words to explain how to convert from ˚F to ˚C?
All of these temperatures are measured in degrees
fahrenheit
. Brianne and
Rana
want to change them into degrees Celsius, which is what we use in NZ.Slide6
Multiplication & Division in AlgebraThe symbols × and ÷ are not used often in algebra.Leave out the multiplication sign. E.g. 5 lots of
x, or 5 × x
, is written as 5
x.
Instead of writing a division sign, use the fraction symbol. E.g.
x
divided by 8, or
x
÷ 8, is written as .
Copy down these expressions & write them as simply as possible.
4
× y 2. x ÷ 2 3. y × x
× 9 4. 6
÷
x
5. 4x
÷ 3y
6. y
× 3x 7. 6y × x 8. 2x ÷ ySlide7
Addition & SubtractionE.g. 18 more than x
→ x + 18 4 subtracted from
x
→
x
– 4
y
increased by 34 →
y + 34 half of a times b, plus 7 →
+ 7
1. x decreased by 15
2. 8 less than y
3. 24 more than x
x – 15
y – 8
x + 24