8.7 Proficiency exam

10,500 (10,505)

18,000 (18,038)

5,000 (5,011)

28,000 (27,406)

3,200 (3,116)

4,500 (4,692)

300,000 (288,576)

12 (14)

90 (95)

81 (81.00)

505 (505.0065)

4,371 (4,380.16)

$2\left(\text{60}\right)+2\left(\text{90}\right)=\text{300}$ (298)

$2(\text{40})+2(\text{90})=\text{260}$ (263)

$\text{30}+3(\text{80})=\text{270}$ (265)

$3(\text{800})+2(\text{600})=\mathrm{3,}\text{600}$ (3,618)

$\text{25}(\text{10}+4)=\text{250}+\text{100}=\text{350}$

$\text{15}(\text{80}+3)=\mathrm{1,}\text{200}+\text{45}=\mathrm{1,}\text{245}$

$\text{65}(\text{100}-2)=\mathrm{6,}\text{500}-\text{130}=\mathrm{6,}\text{370}$

$\text{80}(\text{100}+7)=\mathrm{8,}\text{000}+\text{560}=\mathrm{8,}\text{560}$

$\text{400}(\text{200}+\text{15})=\text{80},\text{000}+\mathrm{6,}\text{000}=\text{86},\text{000}$

$1+\frac{1}{2}=1\frac{1}{2}$ $\left(1\frac{9}{\text{16}}\right)$

$0+\frac{1}{2}+\frac{1}{2}=1$ $\left(1\frac{\text{47}}{\text{300}}\right)$

$8\frac{1}{2}+\text{14}=\text{22}\frac{1}{2}$ $\left(\text{22}\frac{\text{31}}{\text{48}}\right)$

$5\frac{1}{2}+1\frac{1}{2}+6\frac{1}{2}=\text{13}\frac{1}{2}$ $\left(\text{13}\frac{1}{3}\right)$