Math RBA

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Across
  1. 5. 5³
  2. 6. What is the area of a circle with radius 3cm rounded to 3 sig figs?
  3. 7. (3÷4)⁸ × (4÷3)⁵
  4. 9. Hypotenuse of right triangle: legs 8 and 15
  5. 12. Expand:(3x+1)²
  6. 15. Expand:(2x−3)(x+4)
  7. 18. Upper Bound of 7.52
  8. 19. Area of parallelogram: base 11 cm, height 8 cm
  9. 20. Expand: (2x−5)²
  10. 21. Expand:(x+3)(x−3)
  11. 22. Hypotenuse of right triangle: legs 5 and 12
  12. 29. (–2÷5)⁻⁴
  13. 30. Shown below is triangle RST. Angle SRT is 53°, to the nearest degree. ST is 17cm to the nearest centimetre. Work out the upper bound for the length of RS.
  14. 31. Expand: (x+2)(x+5)
  15. 34. Area of a circle
  16. 36. The square root of a number plus two is the same as the number. How many possible answers are there?
  17. 37. How many distinct ways can XYZ be arranged?
  18. 39. aᵐ x bᵐ
Down
  1. 1. The length of the base of a triangle is 10cm, correct to 2 significant figures. The length of the perpendicular height of a triangle is 15cm, correct to 2 significant figures. Calculate the upper bound for the area of the triangle.
  2. 2. Ten years ago the ratio between the ages of Siddharth and Mahir was 3:5. 11 years hence it will be 11:16. What is the present age of Siddharth?
  3. 3. Missing leg: hypotenuse 13, other leg 5 Answer: 12
  4. 4. (a+b)²
  5. 8. Area of trapezium: bases 10 cm and 6 cm, height 5 cm
  6. 10. 7 workers can make 210 pairs of cup in 6 days. How many workers are required to make 450 pairs of cup in 10 days?
  7. 11. (a-b)²
  8. 13. (2²)²×2³
  9. 14. Upper Bound of 6
  10. 16. Area of rectangle: length 8 cm, width 3 cm
  11. 17. Area of triangle: base 10 cm, height 6 cm
  12. 19. Missing leg: (hypotenuse 10, other leg 6) x 10 = ?
  13. 23. The cost of petrol rises by 2 cents a liter. last week a man bought 20 liters at the old price. This week he bought 10 liters at the new price. Altogether, the petrol costs $9.20. What was the old price for 1 liter?
  14. 24. A can do a work in 14 days and working together A and B can do the same work in 10 days. In what time can B alone do the work?
  15. 25. Suppose your grades on three math exams are 80, 93, and 91. What grade do you need on your next exam to have at least a 90 average on the four exams?
  16. 26. In how many ways can 5 distinct books be arranged on a shelf?
  17. 27. Upper Bound of 8.2
  18. 28. Area of circle: radius 7 cm (use π=22÷7)
  19. 31. x⁵÷x³
  20. 32. (5÷7)⁵ × (5÷7)⁻⁶
  21. 33. 10⁰/10³ (Write in Standard Form)
  22. 35. The ratio of base to height of a triangle is 3:4. If the area of the triangle is 6, which type of angled triangle is it?
  23. 38. aᵐ x aⁿ