Wiskundehulp
NLEN

Practice

Short sessions with steps after every answer, a check for common mistakes, and an optional test mode.

Modules

  1. Percentages

    Percent of a number, part of a whole, percentage change. Test mode.

    Sample question Calculate 60% of 70.

  2. Fractions

    Add, subtract, multiply, divide and simplify. Test mode.

    Sample question Calculate 2/7 + 2/4.

  3. Pythagoras

    The hypotenuse and the missing leg of a right triangle. Test mode.

    Sample question Calculate the hypotenuse c when a = 8 and b = 6.

  4. Linear equations

    ax + b = c, and x on both sides. Test mode.

    Sample question Calculate x in 4x − 6 = −10.

  5. Quadratic formula

    The discriminant and both roots (abc-formule). Test mode.

    Sample question Calculate the discriminant D of x² − 2x − 3 = 0.

  6. Mean

    Sum ÷ count, with median questions mixed in later. Test mode.

    Sample question Calculate the mean of 9, 4, 4, 8.

  7. SOHCAHTOA

    Sides and angles with sine, cosine and tangent. Test mode.

    Sample question Calculate the adjacent side when α = 30° and the hypotenuse is 7. Round to 2 decimal places.

  8. Exponential growth

    Growth factor, N = B · gᵗ, doubling time and half-life. Test mode.

    Sample question Calculate the amount after 2 periods if the starting value is 250 and the amount decreases by 5% each period. Round to 2 decimal places.

  9. Derivatives

    Power rule, slope at a point and tangent line. Test mode.

    Sample question Calculate the slope f'(1) of f(x) = -2x^4 − 4x − 5.

  10. Normal distribution

    The rules of thumb: percentages, bounds and σ. Test mode.

    Sample question The height of a group of students is normally distributed with μ = 175 cm and σ = 5 cm. Use the rules of thumb to calculate what percentage lies above 165 cm.

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