Top Basic Math Tricks to Solve Screening Test Questions Fast and Accurately

Top Basic Math Tricks to Solve Screening Test Questions Fast and Accurately

Math tricks make solving problems faster and easier, especially in screening tests. They help you handle calculations quickly, avoid mistakes, and save time. Using simple shortcuts for multiplication, division, percentages, squares, and fractions lets you solve questions confidently without a calculator. These techniques are great for exams with tight time limits, helping you work both smart and fast.

Quick Multiplication Shortcuts

Multiply by 11: Add the two digits and put the sum in the middle. Example: 23 × 11 → 2 + 3 = 5 → 253.

Multiply by 5: Divide the number by 2 and then multiply by 10. Example: 48 × 5 → 48 ÷ 2 = 24 → 24 × 10 = 240.

Multiply by 9: Multiply by 10 and subtract the original number. Example: 27 × 9 → 270 − 27 = 243.

Squaring Numbers Quickly

Numbers ending in 5: Multiply the first digit by one more than itself and add 25 at the end. Example: 35² → 3 × 4 = 12 → 1225.

Numbers close to 100: Use (100 − n)² → 10000 − 200n + n². Example: 97² → 10000 − 19400 + 9 = 9409.

Division Tricks

Dividing by 5: Multiply by 2 and divide by 10. Example: 235 ÷ 5 → 235 × 2 = 470 → 470 ÷ 10 = 47.

Dividing by 25: Multiply by 4 and divide by 100. Example: 175 ÷ 25 → 175 × 4 = 700 → 700 ÷ 100 = 7.

Percentages Made Easy

Find 10%, 5%, 1% quickly: 10% = divide by 10, 5% = half of 10%, 1% = divide by 100.

Any percentage: Convert it into a fraction of 100. Example: 18% of 250 → 18/100 × 250 = 45.

Addition & Subtraction Tricks

Rounding method: Round numbers to the nearest 10 or 100, calculate, then adjust. Example: 198 + 276 → 200 + 276 = 476 → 476 − 2 = 474.

Break numbers: 57 + 68 → 50 + 60 = 110, 7 + 8 = 15, Total = 125.

Shortcut for Fractions

Simplify before multiplying: 12/15 × 10/8 → 4/5 × 5/4 = 1.

Convert to decimals only if it’s simple.

Speedy Square Roots

Memorize perfect squares up to 30².

For numbers between squares, approximate. Example: √50 → between √49 = 7 and √64 = 8 → ~7.07.

Calendar & Age Tricks

Find the day of the week using modulo 7.

For age problems, use differences and subtract instead of solving full equations.

Ratio & Proportion

Compare ratios by cross-multiplying.

Split numbers using the ratio fraction. Example: 120 in 2:3 ratio → 120 × 2/5 = 48, 120 × 3/5 = 72.

Mental Calculation Strategy

Estimate first to check if the answer makes sense.

Break complex problems into smaller steps.

Memorize multiplication tables, squares, cubes, and common fractions.

Using these basic math tricks can save you time and reduce mistakes in screening tests.

With practice, you’ll solve problems faster, handle complex calculations with ease, and improve your confidence. Mastering these shortcuts lets you focus on strategy rather than lengthy calculations, giving you an edge in any timed exam.