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Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd 8-point compass.

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Presentation on theme: "Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd 8-point compass."— Presentation transcript:

1 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd 8-point compass

2 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

3 Acute angle

4 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Angles smaller than 90 are called acute angles. Example:

5 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Approximately equal to ( )

6 The sign means approximately equal to. Example: 3468 3470 (when rounded to the nearest ten) Approximately equal to ( ) Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

7 Centre mark

8 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

9 Common factors

10 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Example: 1 and 2 are common factors of 6 and 10.

11 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Common multiples

12 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Example: 6, 12 and 18 are some common multiples of 2 and 3.

13 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Coordinates

14 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Example: The strawberry is located at the point (2, 4). The point (2, 4) is a pair of coordinates.

15 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Coordinate grid

16 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Example: This is a coordinate grid.

17 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Degree ( )

18 We measure the size of an angle in degrees. We can also write for degree(s). Degree ( ) Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

19 East

20 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

21 Factors

22 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd The factors of a number are the numbers that it can be divided exactly by. Example: The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40.

23 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Heptagon

24 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd A heptagon has 7 straight sides and 7 vertices. Example:

25 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Hundreds

26 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Example: 2 hundreds = 200 We can say that the value of 2 hundreds is the same as 200.

27 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Inner scale

28 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

29 Irregular polygon

30 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd An irregular polygon has sides and angles that are not all equal. Example:

31 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Multiples

32 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd A multiple of a number is the product of that number and any number. A number is a factor of all its multiples. Example: 3, 6, 9 and 12 are the first four multiples of 3.

33 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Net

34 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd A figure which can be folded to form a solid is called the net of the solid. Example: This is a net of a cuboid.

35 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd North

36 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

37 North-east

38 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

39 North-west

40 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

41 Obtuse angle

42 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Angles greater than 90 but smaller than 180 are called obtuse angles. Example:

43 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Octagon

44 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd An octagon has 8 straight sides and 8 vertices. Example:

45 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Origin

46 The pair of coordinates (0, 0) is called the origin. Origin Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

47 Outer scale

48 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

49 Polygon

50 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd A polygon is a closed figure. Its sides are formed by straight lines that do not cross one another. Example:

51 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Prime numbers

52 A prime number has only two factors, 1 and the number itself. Prime numbers Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

53 Product

54 When we multiply numbers, the answer is called the product. Product Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

55 Protractor

56 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd We can find the size of an angle by measuring it with a protractor. Example:

57 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Quadrilateral

58 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd A quadrilateral has 4 straight sides and 4 vertices. Example:

59 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Quotient

60 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd When we divide a number by another, the answer we get is called the quotient. Example:

61 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Regroup

62 We need to regroup in a place value when -we get more than 9 after adding or multiplying; or -we subtract a greater number from a smaller number; or -we get a remainder in place values other than the ones place when dividing Regroup Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

63 Regular polygon

64 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd A regular polygon has all equal sides and all equal angles. Example:

65 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Remainder

66 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Remainder is the amount that is left over when a number is divided by another number. Example:

67 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Right angle

68 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd A right angle is 90. Example:

69 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Round to the nearest hundred

70 When we round a number to the nearest hundred, we look at the digit in the tens place. (a)If the digit < 5, we round it to the smaller hundred. (b)If the digit > 5, we round it to the bigger hundred. (c)If the digit = 5, we round it to the bigger hundred. Round to the nearest hundred Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

71 Round to the nearest thousand

72 When we round a number to the nearest thousand, we look at the digit in the hundreds place. (a)If the digit < 5, we round it to the smaller thousand. (b)If the digit > 5, we round it to the bigger thousand. (c)If the digit = 5, we round it to the bigger thousand. Round to the nearest thousand Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

73 South

74 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

75 South-east

76 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

77 South-west

78 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

79 Thousands

80 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Example: 5 thousands = 5000 We can say that the value of 5 thousands is the same as 5000.

81 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Unit

82 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd Each in a bar model stands for 1 unit. Example: 1 unit 29 5 units 29 × 5 = 145

83 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd West

84 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

85 X-axis

86 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

87 X-coordinate

88 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

89 Y-axis

90 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

91 Y-coordinate

92 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd

93 Zero line

94 Maths Smart Grade 4 © 2012 Alston Publishing House Pte Ltd


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