Chapter 2.4, Problem 2E

For each of the following pairs, write $a$ and $b$ in standard form and use these factorizations to find $(a,b)$ and $[a,b]$

$a=1400,b=980$.

$a=4950,b=10,500$.

$a=13780,b=16,200$.

$a=52,920,b=25,200$