There are various methods for solving appropriate multiplication operations for numbers up to 10 000
Mathematical sentences: \(4\space\times\space121=\underline{\quad\quad}\)
Multiply ones
\(4\space\times\space1\space\text{ones}=4\space\text{ones}\)
Multiply tens
\(4\space\times\space2\space\text{tens}=8\space\text{tens}\)
Multiply hundreds
\(4\space\times\space1\space\text{hundreds}=4\space\text{hundreds}\)
Treat yourself with rewards for your hard work