Download pages from Mental Math Workouts, Grades 7-9

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