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Mental Math Workouts1. 5 2 / 3= 5 / 62. ÷ 4 = 3 r 23. 10 x / = 14. Complete the series below.2, 7, 4, 14, 6, 21, ,5. 3 x x x = 6Use whole numbers.6. 2 / 5+ / + / + / = 17. Twin primes have one composite number betweenthem. Write 2 pairs of twin primes.8. 7 / 20= % =, and ,9. Shade 2 numbers which are consecutive numbersand also primes.10. 48 x 23 is the same as:(a) (48 x 2) + (48 x 3)(b) (40 x 20) + (4 x 3)(c) (48 x 20) + (48 x 3)11.0.2 7 3 6 5 6 7C- Set 113.Rainfall (mm)name:……………………(a)(b)(c)Which line is 1 / 3the length of the top line?14. Label its dimensions after you drawa square the same area as thisrectangle on the back of this sheet.15.504030201006 Months’ RainfallJ F M A M JMonth16. A trapezoid has one pair ofparallel sides. Draw 3 lines anddivide this octagon into 2 trapezoidsand 2 right-angled triangles.17. Base angles of an isoscelestriangle are congruent.18.Angle ABC = °AREA36 m 2The averagemonthlyrainfall ismm.CPerimeter of thissquare = meters.A30°B?BAEstimated degrees in angle ABC = °.19. Draw the next shape in this series.12. This teacup holdsapproximately:(a) one liter (b) 1 / 4liter(c) 20 mL (d) 2 liters20. The radius of this circleis cm or mm.Page 10 Mental Math Workouts © World Teachers Press ® www.worldteacherspress.com

Mental Math Workouts1. 2 x 4 x / = 42. 2.763 = 2 + 0. + 0. + 0.7 / 10 6 / 100 3 / 1,0003.+ + =4. Write down the factors of 20 in the boxes. Thenshade the factors which are also multiples of 2.5. The set of composite numbers less than 15 are:- Set 26. Express 5 x 5 x 5 x 5 x 9 in index notation:13.Hours Worked6543210name:……………………The averagehours workedper day =14. The area of the shadedpart = cm 2 .12 cmM T W T F SDay12 cmPart-time Worker15. Highlight the circumference of theconcentric circle which has adiameter of 2 cm.16. Is this shape traversable?.7. How many minutesfrom 11:30 a.m. to 1320?8. These are the 3 arrays for 4.How many arrays can bedrawn for the number 6?9. Without working out the sums, the differencebetween (20 x 15) and (15 x 19) is:(a) 20 (b) 19 (c) 15 (d) 1010. 2,009,012 is written:(a) two million and nine thousand and twelve.(b) two million nine thousand twelve.(c) two million nine thousand and twelve.11. AThe angles of anequilateral ∆ arecongruent.Therefore,BC ∠ABC = °.12.17. Circumference = π x diameterπ = 3.14If you needed string to go roundthis circle twice, how muchstring would you need?cm18. Circle thecoordinatereading 4, 2on the grid.432119. P Complete thisdiagram by drawing ina 3-cm diagonal anda line from point P toform an isosceles ∆.20. Shade the 2 shapes with the same perimeters.12 3 4 5 6Circle the 2 similar shapes above.www.worldteacherspress.com © World Teachers Press ® Mental Math Workouts Page 11

Mental Math Workouts1. 6 1 / 4= 6 / 122. ÷ 5 = 4 r 33. 20 x = 5 / 54. Complete the series below:3, 3, 4, 6, 9,13, ,5. 6 x x x = 66. 5 / 8+ + + = 17. Twin primes have one composite number betweenthem (e.g. 5, 7). Write the one pair of twin primesbetween the numbers 20 and 40.8. 3 / = % = 0.25- Set 1 Reviewname:……………………14. Label its dimensions after you draw a square thesame area as this rectangle on the back of thissheet.4 mm16 mm15.14Average daily12sunshine forthis period isHours16.1086420Sunshine from 2/9/94 - 8/9/94S M T W T FDaysX40°The base angles of anisosceles triangle arecongruent.Shours.9. Shade 2 numbers which are consecutive and alsocomposite numbers.5 6 7 9 10 11 1210. 36 x 14 is the same as:(a) (36 x 1) + (36 x 4)(b) (36 x 10) + (36 x 4)(c) (30 x 10) + (6 x 4)11. Estimated degrees inangle ZYX =? YX12. An average bucket would hold about:(a) 10 mL(b) 1 kL(c) 10 L(d) 500 mL13.(a)(b)(c)(d)Z°.Which line is 25% ofthe top line?Ruler needed.Angle XYZ = °17. Two-thirds of the diameter ofthis circle is18.Zcm ormm.Perimeter of this square = mAREA64 m 219. Complete the next shape below.Y20. A trapezoid has one pair of parallel sides. Draw 2lines and divide this hexagon into one trapezoidand 2 triangles.Page 22 Mental Math Workouts © World Teachers Press ® www.worldteacherspress.com

Mental Math Workouts- Set 2 Review1. 12 x 2 x = 613. Circle the 2 similar shapes below.name:……………………2. 3.547 = 3 + 0. + 0. + 0.5 / 10 4 / 100 7 / 1,0003. + + =4. Write down the factors of 24 in the boxes.Then shade the multiples of 3.14. 2 cm 2 cm 2 cm Total area of shaded1 cm1 cm parts = cm 2 .15. Highlight the circumferenceof the concentric circle whichhas a diameter of 1 1 / 2cm.5. The set of prime numbers < 20 =.16.Is this shape traversable?6. Express 3 x 3 x 3 x 8in index notation.8.7. How many minutesfrom 10.15 a.m. to1415?These are the threearrays for 4. How manyarrays can be drawn foreach prime number?9. The difference between (30 x 14) and (15 x 30) is:(a) 15 (b) 30 (c) 14 (d) 6010. 4,012,008 is written:(a) four million twelve thousand eight hundred.(b) four hundred and twelve million and eight.(c) four million twelve thousand eight.A11. The angles of a scalene ∆95° are all different, therefore :17.Radius 5 cm18. Join the coordinateordered pairs A2,B4 and E1 andname the shapeyou have drawn.Circumference = 3 π x diameter.π = 3.14How far would an ant walk if itwent 3 times round the perimeterof this dish?cm4321AB C D E F19. Draw 2 lines inside thisshape to form a rectangle, atrapezoid and an irregularquadrilateral.B50°Angle ACB = °.C20. Use a ruler to measure the shapes and shadethe two shapes with congruent areas.Children's Heights12. RoyThe average height ofRobchildren in this groupGroupEvaTim20 60 100is cm.BACDwww.worldteacherspress.com © World Teachers Press ® Mental Math Workouts Page 23