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Vertical abacus in the second volume of second grade mathematics
/kloc-mental arithmetic addition and subtraction exercises within 0/00.

70-59= 15+59= 58+3 1= 16+56= 96-40= 62-47= 64-40= 58- 14= 97-29= 65+27= 3 1+27= 46- 1 1= 1 4+25= 58-33= 96-54 = 6 1+20= 68-53= 60-3 1= 20+ 15= 46-2 1= 99-74= 70-67= 33+ 15= 98-92= 80-68= 73-52= 35-34= 9 / kloc-0/-78= 83-59= 69- 10= 50 -40= 69-5 1= 12+73= 89- 13= 43-32= 15+76= 69-65= 100-33= 66-34= 76-5 / kloc-0/= 99-43= 9 1-57= 77-67= 55-36= 26- 14= 62-34= 44-30= 25- 17= 14+ 14= 78-67= 42-22= 3 1+3 1 = 30+20= 77-34= 16+2 1= 63- 16= 90-26= 45-35= 39+56= 39+2 9= 9 1-67= 73+ 16= 29+46= 52- 10= 75-25= 3 / kloc-0/+60= 58-5 1= 7 1-20= 45- 13= 95-60= 57+26= 50-44= 99-75= 36-3 1= 42-24= 10+23= 66-53=

52-27=

94-60=

72- 16=

95-49= 3 1+50= 8 1-69= 90-38= 98-3 1= 100-56= 100-77= 62- 10= 63-44= 56-54= 40+43= 14+5 1 = 73-43= 79-59= 654 38+05+ 16= 12+20= 95-39= 49-24= 54- 12= 80-65= 45+54= 30- 16= 48-44= 45+24= 65-65= 22+7 1 = 67+ 10= 74-65= 73-56= 97-83= 74+ 18= 10+66= 68-43= 75-37= 92- 16= 25+ 1 8= 58-46= 84-23= 94-79= 97-34= 68-38= 50+44= 37-27= 89-84= 40-25= 89-27= 27+58= 60-22= 9 9-43= 12+74= 27- 17= 14- 1 / kloc-0/= 84-28= 39- 12= 23+46= 33+45= 46- 14= 66- 18= 82-48= 63-29= 30+59= 69+27= 68-64= 5 1-45= 37- 1 5= 38+49= 62-30= 60+23= 9 1-35= 42-29= 62-62= 3 1+50= 52- 13= 4 1-33= 63-62= 63-5 1= 52- 1 2= 6543 8+000-62= 77+ 18= 88-4 1= 77-20= 96- 17= 55+ 17= 90-52= 70+20=

69-68=

2 1+ 19=

97-50=