Simplification and Approximation
Simplification is the basic art of making math easier. It is the process of turning a long, complex math problem into a single, simple number. To do this correctly, we follow a strict set of rules called BODMAS. This acronym stands for Brackets, Orders (like square roots or powers), Division, Multiplication, Addition, and Subtraction. If you do not follow this order, your answer will be wrong. For example, if you have 2 + 3 x 5, you must multiply 3 and 5 first. This gives 15.
Concepts (3)
Rounding is used in approximation. If the first digit after the decimal is 5, 6, 7, 8, or 9, add 1 to the whole number. If it is 0, 1, 2, 3, or 4, keep the whole number as it is. Example: 54.8 becomes 55. 54.2 becomes 54.
Rounding is used in approximation. If the first digit after the decimal is 5, 6, 7, 8, or 9, add 1 to the whole number. If it is 0, 1, 2, 3, or 4, keep the whole number as it is. Example: 54.8 becomes 55. 54.2 becomes 54.
Series questions ask you to find the next number. Common patterns include constant difference, increasing difference (like +2, +4, +6), or multiplication patterns. Example: In 10, 20, 40, 80, the pattern is multiplying by 2. The next number is 160.
Series questions ask you to find the next number. Common patterns include constant difference, increasing difference (like +2, +4, +6), or multiplication patterns. Example: In 10, 20, 40, 80, the pattern is multiplying by 2. The next number is 160.
This rule defines the order of operations. B = Brackets (), O = Of/Orders (roots/powers), D = Division, M = Multiplication, A = Addition, S = Subtraction. You must solve the equation in this specific order. Example: Solve 20 + 10 ÷ 2.
This rule defines the order of operations. B = Brackets (), O = Of/Orders (roots/powers), D = Division, M = Multiplication, A = Addition, S = Subtraction. You must solve the equation in this specific order. Example: Solve 20 + 10 ÷ 2. You must divide 10 by 2 first to get 5. Then add 20 to get 25.
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Start Lesson: Rounding Off Numbers