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  • Writer's pictureRockfield NS

Maths 20th-24th April

Topic: Length (p.77-82)

· Don’t forget to spend a few minutes every day doing your daily mental maths Week 29 (including problem solving and Friday Review).

You have been introduced to measuring lengths in previous classes. You have done activities like comparing & estimating lengths. You have also progressed to using the kilometre, metre, centimetre and millimetre as the units of measurement when talking about length. This week we will focus on renaming as a fraction or by using the decimal point eg. 2m=0.002km or 12m=0.012km (because there are a thousand metres in a kilometre). The decimal is the most common and useful form so try to work hard on understanding & using the decimal point. Once you understand renaming, addition, subtraction, multiplication and division activities in length shouldn’t be too difficult. We just need to get lots of practice doing the actual sums.

Remember: There are 10mm in 1cm

There are 100cm in 1m

There are 1000m in 1km

*Parents, if your child is unsure of any of the tasks in maths this week please feel free to contact me or prioritise what activities you think they will benefit most from.

Here are some links to online length activities/interactives. Try these out before doing the written work. Please have a look at this poster. It contains length and area fact cards. (choose the centimetre option) (create a shape & find the area and the perimeter) ( go to the units of measurement section-this website is good for practising renaming) (general activities)

· P 77 Q 1-6. For question 3 you could substitute b, d and e for something at home eg. the perimeter of the kitchen table. Google the answer to f before you find the difference.

· P 78 Q 1-7. Look at the examples to help you and remember 100cm=1m and 1000m=1km. You can work on every second sum in each of the questions 1-7. If you get these finished you can go back and do the rest. (Don’t forget in question 5, some fractions can be simplified. For example: (c)10m=10/1000km. However, this can be simplified to 1/100km by cancelling/crossing out a 0 from the top and bottom)

· P 79 Q 1-8. Again start off doing every second sum in each question and go back to the others if you have time. You can convert all of these to their decimal form if you find it easier to add & subtract in that way. Be careful writing Q4 & Q8 vertically! Make sure you convert all of them to decimals & this will help you to write each sum correctly. For example, in Q4(a) 2.6cm stays as it is, 6mm changes to 0.6cm and 15mm changes to 1.5cm. Then we write the sum vertically and add.

Have a look at these clips before starting: (an animation showing the addition of metres and centimetres) (an animation showing the division of metres and kilometres)

· P80 Q 1-11. Once again start off doing every second sum in each question and go back to the others if you have time. It might be easier to convert to a decimal when doing these sums. Look at the examples above q.1-3 when doing these. You must convert to a decimal in Q4. For example, (b) 4cm 9mm=4.9cm.

Remember-when you are finding a fraction of a number you divide by the bottom and multiply by the top. For example, Q6(c) 2/3 of 7cm 8mm (or if we write it as a decimal it’s 7.8cm): 7.8cm divided by 3=2.6cm so then we multiply 2.6cm by 2 to get 5.2cm.

· P 81 Q 1-7 (Maybe you could try doing Q8 by drawing a plan of your bedroom or another room at home? Try Q9 if you have time-you will need an atlas & the internet for this Q). To find the area we multiply the length by the width and to find the perimeter we add all the sides.

Remember, we’ve been doing questions on scale in our mental maths book for some time. A drawing that shows a real object with actual sizes reduced or enlarged by a certain amount is called the scale. I’ve put a photo of an explanation which should help you on our blog page.

If you get everything finished you could try some of the problems on p.82. You can underline important words with a pencil- this will help you to decide which operation you need to carry out. Don’t forget-some problems will require more than one operation.

Make sure you start with mental maths each day. We need to keep on top of this. Just do your best and don’t worry if you do not get all of the activities finished. Don’t forget to correct the answers to Mathemagic & Mental Maths as they appear on the blog.

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