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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
Page 1: Mental Math Workouts1. 5 2 / 3= 5 /

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