Solve the number sentences involving multiplication of any numbers up to four digits by a one-digit number, 10, 100 and 1000 with the product up to 10 000

Multiplication within 10 000

2.3

Multiplication within 10 000

There are various methods for solving appropriate multiplication operations for numbers up to 10 000

Examples of questions and solutions to multiplications operations
Mathematical sentences: \(4\space\times\space121=\underline{\quad\quad}\)
\(\begin{array} {rr} \space\space1\space2\space1 \\\times\space\space\space\space\space\space\space4 \\\hline\space\space4 \\\hline \end{array}\)	\(\begin{array} {rr} \space\space1\space2\space1 \\\times\space\space\space\space\space\space\space4 \\\hline\space8\space4 \\\hline \end{array}\)	\(\begin{array} {rr} \space\space1\space2\space1 \\\times\space\space\space\space\space\space\space4 \\\hline4\space8\space4 \\\hline \end{array}\)
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 \(4\space\times\space1\space\text{hundreds}=4\space\text{hundreds}\)

So, \(4\space\times\space121=\underline{484}\)

2.3

Multiplication within 10 000

There are various methods for solving appropriate multiplication operations for numbers up to 10 000

Examples of questions and solutions to multiplications operations
Mathematical sentences: \(4\space\times\space121=\underline{\quad\quad}\)
\(\begin{array} {rr} \space\space1\space2\space1 \\\times\space\space\space\space\space\space\space4 \\\hline\space\space4 \\\hline \end{array}\)	\(\begin{array} {rr} \space\space1\space2\space1 \\\times\space\space\space\space\space\space\space4 \\\hline\space8\space4 \\\hline \end{array}\)	\(\begin{array} {rr} \space\space1\space2\space1 \\\times\space\space\space\space\space\space\space4 \\\hline4\space8\space4 \\\hline \end{array}\)
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 \(4\space\times\space1\space\text{hundreds}=4\space\text{hundreds}\)