1. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Angle

2. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd An angle is formed when two straight lines meet at a point. It is also the amount of turning between two straight lines which meet at a point. Example: An angle is marked with a curved line.

3. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Backward

4. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd To move in a reverse direction. Example: Ari moves 4 squares backward to get to the tree.

5. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Bar model

6. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A bar model can be used to represent a word problem. Example: There are 15 orange ribbons and 8 blue ribbons. How many ribbons are there altogether?

7. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Between

8. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: 265 is exactly between 260 and 270.

9. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Column

10. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: The columns on this grid reference are labelled with the letters A to E. The column in yellow is Column C.

11. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Comparison model

12. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A comparison model is a type of bar model. It helps us compare two sets of objects. Example: Ari has 78 more than Tom.

13. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Composite solid

14. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A composite solid is a model that is made up of different solids. Example:

15. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Edge

16. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd In a solid, an edge is formed when two faces meet. It can be curved or straight. Example:

17. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Estimate

18. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A reasonable guess of the actual number.

19. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Face

20. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd One part of the solid; it can be flat or curved. Example:

21. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Forward

22. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd To move ahead, towards the front. Example: Rita walks 2 squares forward to get to the tree.

23. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Grid reference

24. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd When we give the grid reference of an object or a place, we always give the column information first and then the row information. Example: The turtles are in column A and row 1. So, their position on the grid reference is A1.

25. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Half turn

26. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: Half turn = 2 right angles

27. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Hexagonal prism

28. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A hexagonal prism has 8 faces, 18 edges and 12 vertices. Its opposite faces are in the shape of a hexagon. Example:

29. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Hundreds

30. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: 2 hundreds = 200 We can say that the value of 2 hundreds is the same as 200.

31. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Line of symmetry

32. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A line of symmetry cuts a figure into two halves that fit onto each other exactly when the figure is folded along that line. Example:

33. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Multiples

34. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: When any number is multiplied by 3, the answer is a multiple of 3.

35. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd One thousand

36. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: Ten hundreds = One thousand

37. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Part-whole model

38. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A part-whole model is a type of bar model. Example: There are 465 children altogether. If there are 240 boys, how many girls are there? We can find the missing part (girls) by subtracting the known part from the whole.

39. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Pentagonal prism

40. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A pentagonal prism has 7 faces, 15 edges and 10 vertices. Its opposite faces are in the shape of a pentagon. Example:

41. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Prism

42. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A prism is a solid that has only straight edges. The two opposite faces of the prism are the same shape and size. Example:

43. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Quarter turn

44. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: Quarter turn = 1 right angle

45. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Range

46. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A range of numbers is a set of numbers. Example: The range ‘30 to 40’ includes the following numbers: 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 and 40.

47. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Rectangular prism

48. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A rectangular prism has 6 faces, 12 edges and 8 vertices. Its opposite faces are in the shape of a rectangle. Example:

49. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Regroup

50. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd We need to regroup in a place value when - we get more than 9 after adding; or - we subtract a greater number from a smaller number. Example:

51. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Right angle

52. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd The angle at the corner of a folded piece of paper is a right angle. Example: A right angle is marked with a.

53. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Round to the nearest hundred

54. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd 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 to the smaller hundred. (b) If the digit > 5, we round to the bigger hundred. (c) If the digit = 5, we round to the bigger hundred. Example:

55. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Round to the nearest ten

56. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd When we round a number to the nearest ten, we look at the digit in the ones place. (a) If the digit < 5, we round to the smaller ten. (b) If the digit > 5, we round to the bigger ten. (c) If the digit = 5, we round to the bigger ten. Example:

57. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Row

58. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: The rows on this grid reference are labelled with the numbers 1 to 5. The row in yellow is Row 4.

59. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Square number

60. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd When we multiply a number by itself, we get a square number. Example:

61. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Symmetric figure

62. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A symmetric figure is a figure that has one or more lines of symmetry. Example: These are symmetric figures.

63. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Three quarter turn

64. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: Three quarter turn = 3 right angles

65. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Triangular prism

66. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A triangular prism has 5 faces (3 rectangular and 2 triangular), 9 edges and 6 vertices. Its opposite faces are in the shape of a triangle. Example:

67. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Turn left/right

68. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: Tom turns right at E5 and moves forward 3 squares. He then turns left at E2 and moves forward 4 squares.

69. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Vertex (Vertices)

70. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd A vertex is formed when two sides meet at a point. The plural of vertex is vertices. Example:

71. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Whole turn

72. Maths SMART Grade 3 © 2012 Alston Publishing House Pte Ltd Example: Whole turn = 4 right angles