Mental Math Workouts - Set 1 1. 5 2/3 = 5 2. 13. /6 (a) (b) (c) Which line is 1/3 the length of the top line? ÷ 4 = 3r2 3. 10 x / name:…………………… = 1 14. Label its dimensions after you draw a square the same area as this rectangle on the back of this sheet. 4. Complete the series below. 2, 7, 4, 14, 6, 21, , 6 Months’ Rainfall 15. 5. 3 x x x 50 = 6 6. 2/5 + / + / + / Rainfall (mm) Use whole numbers. = 1 7. Twin primes have one composite number between them. Write 2 pairs of twin primes. , and 8. 7/20 = 10. 48 (a) (b) (c) 3 6 5 6 7 F M A Month M J 16. A trapezoid has one pair of parallel sides. Draw 3 lines and divide this octagon into 2 trapezoids and 2 right-angled triangles. A 17. Base angles of an isosceles triangle are congruent. (48 x 2) + (48 x 3) (40 x 20) + (4 x 3) (48 x 20) + (48 x 3) Angle ABC = 30° ° C B 18. C AREA 36 m2 Perimeter of this meters. square = 19. Draw the next shape in this series. ? B Estimated degrees in angle ABC = Page 10 10 x 23 is the same as: 11. 12. 20 J 9. Shade 2 numbers which are consecutive numbers and also primes. 7 The average monthly rainfall is mm. 30 0 , % = 0. 2 40 A °. This teacup holds approximately: (a) one liter (b) 1/4 liter (c) 20 mL (d) 2 liters 20. Mental Math Workouts The radius of this circle is cm or mm. © World Teachers Press® www.worldteacherspress.com Mental Math Workouts - Set 2 / 13. = 4 2. 2.763 = 2 + 0. + 0. 7/ 10 3. + Part-time Worker 6 Hours Worked 1. 2 x 4 x name:…………………… + 0. 6/ 100 + 3/ 1,000 = 5 4 The average hours worked per day = 3 2 1 . 0 M 4. Write down the factors of 20 in the boxes. Then shade the factors which are also multiples of 2. 5. The set of composite numbers less than 15 are: W T Day F S The area of the shaded part = cm2. 12 cm 14. T 12 cm 15. Highlight the circumference of the concentric circle which has a diameter of 2 cm. 6. Express 5 x 5 x 5 x 5 x 9 in index notation: 16. Is this shape traversable? 7. How many minutes from 11:30 a.m. to 1320? 17. 8. These are the 3 arrays for 4. How many arrays can be drawn for the number 6? 9. Without working out the sums, the difference between (20 x 15) and (15 x 19) is: (a) 20 (b) 19 (c) 15 (d) 10 10. 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. B C 4 3 2 1 1 19. A 11. 18. Circle the coordinate reading 4, 2 on the grid. Circumference = π x diameter π = 3.14 If you needed string to go round this circle twice, how much string would you need? cm The angles of an equilateral ∆ are congruent. Therefore, ∠ABC = °. P 2 3 4 5 6 Complete this diagram by drawing in a 3-cm diagonal and a line from point P to form an isosceles ∆. 20. Shade the 2 shapes with the same perimeters. 12. Circle the 2 similar shapes above. www.worldteacherspress.com © World Teachers Press® Mental Math Workouts Page 11 Mental Math Workouts - Set 1 Review 1. 61/4 = 6 /12 3. 20 x = 5/5 2. 14. Label its dimensions after you draw a square the same area as this rectangle on the back of this sheet. 4 mm 16 mm ÷5=4r3 4. Complete the series below: 3, 3, 4, 6, 9,13, name:…………………… 15. 14 , Sunshine from 2/9/94 - 8/9/94 12 x 6. 5/8 + x + 10 =6 + Hours 5. 6 x 8 hours. 6 4 =1 2 7. Twin primes have one composite number between them (e.g. 5, 7). Write the one pair of twin primes between the numbers 20 and 40. 0 S 16. 6 7 W Days F S Angle XYZ = °. 12. An average bucket would hold about: (a) 10 mL (b) 1 kL (c) 10 L (d) 500 mL ° Two-thirds of the diameter of this circle is cm or 18. ? Y T The base angles of an isosceles triangle are congruent. Y Z 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) X Z 17. 9 10 11 12 11. Estimated degrees in angle ZYX = T 40° 9. Shade 2 numbers which are consecutive and also composite numbers. 5 M X % = 0. 8. 3/25 = 10. Average daily sunshine for this period is AREA 64 m2 mm. Perimeter of this square = m 19. Complete the next shape below. 20. A trapezoid has one pair of parallel sides. Draw 2 lines and divide this hexagon into one trapezoid and 2 triangles. 13. (a) (b) (c) (d) Page 22 Which line is 25% of the top line? Ruler needed. Mental Math Workouts © World Teachers Press® www.worldteacherspress.com Mental Math Workouts - Set 2 Review 1. 12 x 2 x 13. Circle the 2 similar shapes below. =6 2. 3.547 = 3 + 0. 5/ + 0. + 0. 4/ 10 100 7/ 1,000 14. + 3. name:…………………… + 2 cm 2 cm 2 cm Total area of shaded 1 cm 1 cm = 4. Write down the factors of 24 in the boxes. Then shade the multiples of 3. 15. Highlight the circumference of the concentric circle which has a diameter of 11/2 cm. 5. The set of prime numbers < 20 = 16. . Is this shape traversable? 7. How many minutes from 10.15 a.m. to 1415? 6. Express 3 x 3 x 3 x 8 in index notation. 17. ius 5 Rad 8. These are the three arrays for 4. How many arrays can be drawn for each prime number? 9. The difference between (30 x 14) and (15 x 30) is: (a) 15 (b) 30 (c) 14 (d) 60 10. 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. A 95° 11. Angle ACB = Group 12. Roy Rob Eva Tim °. C Children's Heights 60 19. 3 2 1 B C D E F Draw 2 lines inside this shape to form a rectangle, a trapezoid and an irregular quadrilateral. 20. Use a ruler to measure the shapes and shade the two shapes with congruent areas. A D B cm. C 100 www.worldteacherspress.com © World Teachers Press® 4 A The average height of children in this group is 20 cm Circumference = 3 π x diameter. π = 3.14 How far would an ant walk if it went 3 times round the perimeter of this dish? cm 18. Join the coordinate ordered pairs A2, B4 and E1 and name the shape you have drawn. The angles of a scalene ∆ are all different, therefore : B 50° cm2. parts = Mental Math Workouts Page 23

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