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#### Algebra and arithmetics , Arithmetics. Mental maths

Solve: $HE \times HE = SHE$.

#### Algebra and arithmetics , Arithmetic operations. Number identities , Arithmetics. Mental maths

A six-digit number starts from the digit $1$. If this digit is relocated to the rightmost position, the number becomes $3$ times bigger. What is the number?

#### Algebra and arithmetics , Arithmetics. Mental maths

If $R + RR = BOW$, what is the last digit of the number below?
$$F \times A \times I \times N \times T \times I \times N \times G$$

#### Algebra and arithmetics , Arithmetics. Mental maths

Replace the letters with digits in a way that makes the following sum as big as possible:
$$SEND + MORE + MONEY$$

#### Arithmetics. Mental maths

Decode the encrypted sum
$$M+MEEE=BOOO$$

#### Arithmetics. Mental maths , Mathematical logic (other)

Replace the letters with digits in a way that makes the following sum as big as possible:

SEND +MORE +MONEY

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