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