GCSE Secondary Maths Age 13-17 - Number: Standard Form - Explained

The video tutorial explains how to calculate the value of T using a given formula and values for W and D. It demonstrates the process of substituting values, performing calculations, and converting the result into standard form with three significant figures. The tutorial also addresses the impact of increasing W and D on the value of T, explaining why an increase in both does not necessarily lead to an increase in T. The video concludes with tips on using calculators effectively for such calculations.

What is the formula used to calculate T in the given problem?

• T = D^3 / W

• T = W / D

• T = sqrt(W / D^3)

• T = W * D^3

How is the decimal point adjusted when converting a number to standard form?

• Move it to the left until the last digit is a unit

• Move it to the right until the last digit is a unit

• Move it to the right until the first digit is a unit

• Move it to the left until the first digit is a unit

What is the correct standard form of 4517.53951453 rounded to three significant figures?

• 4.51 * 10^3

• 4.50 * 10^3

• 4.52 * 10^3

• 4.53 * 10^3

What is the effect of rounding on the significant figures of a number?

• It changes the number of significant figures randomly

• It increases the number of significant figures

• It decreases the number of significant figures

• It maintains the number of significant figures

What happens to the value of T when W is increased by 10% and D by 5%?

• T decreases

• T becomes zero

• T remains the same

• T increases

What is the multiplier used to increase a value by 10%?

• 0.10

• 10.0

• 1.01

• 1.10

Why is it important to use brackets in calculations involving powers?

• To make the calculation look neat

• To simplify the expression

• To ensure the correct order of operations

• To avoid using a calculator