$69 \overset{1}{:} 23 \overset{2}{*} 12 \overset{4}{+} 800 \overset{3}{:} 100 = 44$
1) 69 : 23 = 3
2) 3 * 12 = 3 * (10 + 2) = 30 + 6 = 36
3) 800 : 100 = 8
4) 36 + 8 = 44
 
$58 \overset{1}{:} 29 \overset{2}{*} 25 \overset{4}{-} 500 \overset{3}{:} 10 = 0$
1) 58 : 29 = 2
2) 2 * 25 = 50
3) 500 : 10 = 50
4) 50 − 50 = 0
 
$90 \overset{2}{:} (60 \overset{1}{:} 20) \overset{4}{+} 600 \overset{3}{:} 6 = 130$
1) 60 : 20 = 3
2) 90 : 3 = 30
3) 600 : 6 = 100
4) 30 + 100 = 130
 
$42 \overset{3}{+} 70 \overset{1}{:} 5 \overset{2}{*} 4 = 98$
1) 70 : 5 = (50 + 20) : 5 = 10 + 4 = 14
2) 14 * 4 = (10 + 4) * 4 = 40 + 16 = 56
3) 42 + 56 = 98
 
$92 \overset{3}{-} 92 \overset{1}{:} 4 \overset{2}{*} 2 = 66$
1) 92 : 4 = (80 + 12) : 4 = 20 + 3 = 23
2) 23 * 2 = 46
3) 92 − 46 = 92 − 42 − 4 = 50 − 4 = 46
 
$84 \overset{2}{:} (7 \overset{1}{*} 3) \overset{3}{*} 100 = 400$
1) 7 * 3 = 21
2) 84 : 21 = 4
3) 4 * 100 = 400