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Unit 2: See it, do not compute it

Squares and quick products

Read this before the quizzes

Squares 11 to 30: learn them once

Squares ending in 5

Next to a round number

Products near 100 and 1000

Squares: question 1

Squares: question 2

Answers and why: squares

Cubes and powers

Cubes 2 to 15

Folding powers together

Cubes: question 1

Cubes: question 2

Answers and why: cubes

Fractions, decimals and percents

The table to know

Using equivalents inside a sum

Decimals in products

Equivalents: question 1

Equivalents: question 2

Answers and why: equivalents

Approximation

Round, keep the order, compare

What not to do

Estimating: question 1

Estimating: question 2

Answers and why: approximation

Quick multiplication and division

Multiply by what you can see

Divisibility, quickly

Quick products: question 1

Quick products: question 2

Answers and why: quick products

Number series

Five tests, in this order

Gaps of the gaps

Mixed, alternating and sum-of-previous

Series: question 1

Series: question 2

Answers and why: series

Simplification chains and wrap-up

The order and the move

Chains: question 1

Chains: question 2

Answers and why: chains

Your one-week mission

Formula cards to carry (45)

See it, do not compute it. This unit gives you the toolkit for the quick part of a number test: squares and cubes, fraction-decimal-percent equivalents, estimates, products near round numbers, number series and simplification chains.

Quantitative Aptitude Unit 2: Number sense and speed arithmetic

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