Mental Math And Logic Statements

Decompose numbers for mental addition and evaluate absolute logic statements.

4 lessons

9b3f6de5...

learn

Mental Chunking

Breaking big numbers into friendly pieces.

When working with large numbers, it is often difficult to add them straight in your head. Chunking allows you to break large target numbers into smaller, easy-to-add pieces.

1 / 3

67244cf6...

IMAGE

Mental Chunking

Break a large number in smaller chunks

$Professional educational mechanism-diagram showing numbers inside central rounded boxes: 25000, 400, 13000, 1500, 60000 arranged in a vertical column. Straight arrows point outward from these central numbers, combining to reach target sums on the left and right. Specifically, arrows flow from 25000, 400, and 13000 pointing towards the target sum 38800 displayed on the left side.$

Click to zoom

Mapping central number chunks to construct larger sum targets.

5baae746...

practice

Always, Sometimes, Never (Addition)

Determine the truth of a sum rule.

1 / 5

Evaluate the statement: 'A 5-digit number + a 5-digit number gives a 5-digit number.'

87fda722...

practice

Always, Sometimes, Never (Subtraction)

Determine the truth of a difference rule.

1 / 5

Evaluate the statement: 'A 5-digit number - a 2-digit number gives a 3-digit number.'

← previousThe Magic Number Of Kaprekar next →Visual Sums And The Collatz Conjecture