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Year 4 maths facts | Year 3 maths facts | 

Mental Mathemagicians

 

Year 4 Maths facts

Number facts

 

1. Know all number pairs which total 100 (e.g. 25 + 75, 42 + 58, 17 + 83)

2. Know all multiplication and division facts for the 2,3,4,5,6,7,8,9 and 10 times tables.

3. Know that ½ = 0.5, ¼ = 0.25, 1/10 = 0.1 and 1/100 = 0.01

 

Understanding shape

 

4. Know that a polygon is a closed, flat shape with three or more sides

5. Know that a regular polygons have equal sides and equal angles

6. Know the names and properties of 2D shapes as year three and:

Heptagon- a 7-sided shape

Oblong- 4-sided two right angles and two pairs equal sides but the pairs are a different length to each other

7. Know that an equilateral triangle has 'equal sides' and 'equal angles'

8. Know that an isosceles triangle has two equal sides and angles.

9. Know that a horizontal line goes across and a vertical line goes downwards

10. Know the names of 3D shapes as year three and:

Tetrahedron: Four triangular faces

Polyhedron: solid 3D shape

11. Know that one whole turn= 360 degrees, a half turn=180 degrees and a quarter turn (or right angle) = 90 degrees.

12. Know the direction of the compass points for North, South, East, West, North East, North West, South East, South West.

 

Measures

 

13. Know that 'kilo' means 1000, 'milli' means a thousandth and 'centi' means a hundredth.

14. Know that to convert m to cm, you multiply by 100 and to convert cm to m you divide by 100. (e.g. 4m = 400cm, 550cm = 5.5M)

15. Know that ½ a kg is 500g and ¼ is 250g, know that ½ km is 500m and ¼ km is 250g, Know that ½ L is 500ml and ¼ L is 250ml and that ½ M is 50 cm and ¼ M is 25cm

16. Know that 1000 years = a millennium

17. Know that a leap year has 366 days.

18. Know that the perimeter is the distance around the shape

19. Know that the area is how much surface the shape covers

 

EXPLANATION AND IDEAS FOR LEARNING

 

Multiplication and division facts: When children learn a times tables fact such as 4 X 5=20 they also know the associated division fact: 20 ÷ 4= 5.

 

Memory tricks- 

Make up rhymes for tables that children frequently forget. For example: 8 X 3= Aliens at the door- 24.

 

Actions to go with tables facts 'Eight eights are sixty four, clap, clap, knock on the floor.'

 

Use an ordinary pack of playing cards!

 

A great way to practise table facts is to share out playing cards between you and your child. Both turn a card over and the quickest one to multiply the numbers keeps the cards. The winner is the person with the most cards.

 

TRIANGLES

 

Memory Trick

Equilateral - equal sides, equal angles- equilateral

Isosceles - I sausages (imagine two sides as sausages the same length).

 

Horizontal/vertical lines

 

Ask the child to show you with their arms a vertical line/ a horizontal line or link horizontal to a picture of a horizon.

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