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#### Arithmetics. Mental maths , Volume

A cube with a side of 1 m was sawn into cubes with a side of 1 cm and they were in a row $($along a straight line$)$. How long was the line?

#### Puzzles

Decipher the puzzle:

#### Arithmetic operations. Number identities , The fundamental theorm of arithmetic. Prime factorisation.

Try to get one billion $1000000000$ by multiplying two whole numbers, in each of which there cannot be a single zero.

#### Division with remainder

Will the quotient or the remainder change if a divided number and the divisor are increased by 3 times?

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