ATLAS Grade 4 Operations and Algebraic Thinking. Practice it free.

Add the digits: $9 + 9 = 18\textsf{.}$

Three $6\text{s}$ make $18$: $6\textsf{,}$ $12\textsf{,}$ $18\textsf{.}$

The smallest prime number is $2$.

The last digit of $130$ is $0\textsf{,}$ so $130$ is divisible by $10\textsf{.}$

$36$ is a multiple of $9$: $9\textsf{,}$ $18\textsf{,}$ $27\textsf{,}$ $36\textsf{,}$ $\ldots$

$23$.

The last digit of $84$ is $4\textsf{,}$ which is even, so $84$ is divisible by $2\textsf{.}$

Four $8\text{s}$ make $32$: $8\textsf{,}$ $16\textsf{,}$ $24\textsf{,}$ $32\textsf{.}$