In deze les zitten 11 slides, met interactieve quizzen en tekstslides.
Lesduur is: 50 min
Onderdelen in deze les
Which exercises should we discuss on the board?
Slide 1 - Woordweb
Writing formulas shorter
The formula 24 - 3 x time = height can be shortened.
When you write a formula shorter you do two things: - replace the variable with a letter that represents that variable - leave out the multiplication sign.
Slide 2 - Tekstslide
Writing formulas shorter
24 - 3 x time = height - replace the variable with a letter that represents that variable. 24 - 3 x t = h - leave out the multiplication sign. 24 - 3t = h
Slide 3 - Tekstslide
Mistakes to watch out for!
- replace the variable with a letter that represents that variable 12 + 3 x time = temperature 12 + 3 x t = t is WRONG, because you use the letter t for two different variables. Possible ways to shorten the formula are: 12 + 3 x t = T 12 + 3 x t = c (c for temperature in degrees Celcius) 12 + 3 x h = c (h for time in hours) etc.
Slide 4 - Tekstslide
Mistakes to watch out for!
- replace the variable with a letter that represents that variable 50 - 4 x time = water level 50 - 4 x t = w l is WRONG, because you use two letters for one variable (water level). Only use one letter per variable: 50 - 4 x t = w
Slide 5 - Tekstslide
Mistakes to watch out for!
- leave out the multiplication sign. 12 - a x 3 = t 12 - a3 = t is WRONG! When leaving out the multiplication sign in a x 3, you always write the number before the letter. a x 3 = 3 x a = 3a.
You shorten the formula like this: 12 - 3a = t
Slide 6 - Tekstslide
Shorten the formula 12 + 3 x time = height
Slide 7 - Open vraag
Shorten the formula price = 50 + time x 10
Slide 8 - Open vraag
Shorten the formula b = a x 15 -2
Slide 9 - Open vraag
Shorten the formula number of yellow beads = number of blue beads x 5