First:
[tex]\begin{gathered} 100+150=250 \\ 250\text{ is a number written correct to 2 significant figures.} \end{gathered}[/tex]
Next:
[tex]\begin{gathered} 1.5+3.75=5.25 \\ 5.25\text{ is a number written correct to 3 significant figures.} \end{gathered}[/tex]
0.903 is a number written correct to 3 significant figures.
Finally:
7.107 is a number written correct to 4 significant figures.
