Length

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

Welcome to maths

Need: 

• Book open on p. 114
• Notebook open on an empty page (with a margin)
• Pen 
• Pencil (+sharpener and eraser)
• Geo triangle

LessonUp class code oodxx

Sororya and Basel: Please add yourself to class '1G maths' via lessonup

Follow the steps

• Timer? Use it, so you can see how much time it will take you
• A 'hotspot'? Click on it and get extra information or the answer
• Always write the calculations and answer in your notebook as well
• It is easier when you use your phone, because you need to take pictures. 
• Mind the notation of your answers --> 0.25 dm and not 0,25 dm or 0.25dm

This is a hotspot

It can have a different picture. Click on it and it will give you extra information or answers. 

Make a note and copy this 

1 kilometre (km) = 1000 m (kilo = thousand)

1 hectometre (hm) = 100 m (hector = hundred)

1 decametre (dam) = 10 m (deca = ten)

1 decimetre (dm) = 0.1 m (deci = one tenth)

1 centimetre (cm) = 0.01 m (centi = one hundredth)

1 millimetre (mm) = 0.001 m (milli = one thousandth)

Goal

• I can 'Perform calculations with length'
• I can 'Copy and fill in'
• I can 'Check and correct my work'

Convert 0.25 dam to km

See p. 114

<div>How many steps do you need to take?&nbsp;</div><div>Do you divide or multiply?</div><div><br></div><div>0.25 dam = ..... hm = ..... km</div><div>Two steps and you need to divide. So 0.25 : 10 : 10 = 0........</div>

Convert 0.25 m to dm

See p. 114

<div>How many steps do you need to take?&nbsp;</div><div>Do you divide or multiply?</div><div><br></div><div>0.25 m = ..... dm&nbsp;</div><div>One step and you need to multiply. So 0.25 x 10&nbsp; = ........</div>

Calculate
2 km + 3 dam + 1 hm = .......m

Make sure you write down a 'calculation = answer', so
for instance '20 m + 3000 m + 0.1 m = 3020.1 m' and not just 3020.1.
Be aware, I did not convert the correct way, but you will off course. ;-)

Example

3 dm + 1.5 m + 45 mm = .....cm<div>30 cm + 150 cm + 4.5 cm = 184.5 cm&nbsp;</div>

A stack of paper of 500 sheets is 5.0 cm high.
What is the thickness of one sheet of paper in mm?

Need some help?

<ul><li>Convert to mm first.</li><li>Then divide.</li><li>Does your answer make sense? How thick is a normal sheet of paper?&nbsp;</li></ul>

1. 10 mm
2. 1 mm
3. 0.01 mm
4. 0.1 mm

How much cm ribbon do you need
for this gift box?

Hints

<ol><li>First convert all lengths to cm.</li><li>How many parts of the ribbon are 50 cm?</li><li>Do the same for the other lenghts and add them.&nbsp;</li></ol>

1. 94 cm
2. 400 cm
3. 200 cm
4. No correct answer is given at A, B and C

Work on...

• exercises 6, 7 and 8 on p. 115
• Additional exercises E1 and E2 (see stencil '1TTO C5 Exercises on Magister.me)
• Check your work after 8 minutes with a different colour
• Copy HW in your planner
• HW: Do ex. 6, 7 and 8 on p. 115 + E1 and E2 (stencil)

I have checked my work, I worked hard and I feel like this about my work

😒🙁😐🙂😃

Why did you choose that emoji?
Give at least one reason.

Need help finding a reason?

<ul><li>It is easy, because I did this last year in school.</li><li>I find it difficult, because I cannot divide with decimal numbers.</li><li>I chose the happiest smile, because I checked and corrected my work with a different colour.&nbsp;</li><li>I chose the smiley in the middle, because it was to easy and boring.&nbsp;</li></ul>

Next lesson

• You have finished and checked your homework 
• We will work on Time and Speed