600 − 60 : 6 : 2 = 600 − 30 : 2 = 600 − 15 = 585;
(600 − 60) : 6 : 2 = 540 : 6 : 2 = 90 : 2 = 45;
960 − 640 : (4 + 4) * 2 = 960 − 640 : 8 * 2 = 960 − 80 * 2 = 960 − 160 = 800;
(960 − 640) : 4 + 4 * 2 = 320 : 4 + 8 = 80 + 8 = 88.

176 + 218 + 206 = 600
$\begin{array}{r}\underline{\begin{array}{r}\text{176}\\ \text{+218}\\ \text{+206}\end{array}}\\ \hfill \text{600}\hfill \end{array}$
 
295 + 217 + 488 = 1000
$\begin{array}{r}\underline{\begin{array}{r}\text{295}\\ \text{+217}\\ \text{+488}\end{array}}\\ \hfill \text{1000}\hfill \end{array}$