Introduction to # Junior 2 # Oral calculation is one of the mathematics teaching methods. A calculation method based on thinking and language activities without any tools. It can train students to calculate quickly and develop their attention, memory and thinking ability. Proficiency in verbal calculation is helpful for written calculation and is convenient for daily use. The following is an unorganized "Two-digit addition and subtraction oral calculation in the second grade of primary school (three articles)", I hope it will help you.

Article 1 (1) 20-15 = (2) 63-46 =

(3)70-60=

(4)76+ 14=

(5)84-80=

(6)62+29=

(7)40+ 19=

(8)94-86=

(9)44+2 1=

( 10)74+65=

( 1 1)89+55=

( 12)39+2 1=

( 13)79-67=

( 14) 12+ 1 1=

( 15)93+24=

( 16)88-33=

( 17)89-44=

( 18)87-7 1=

( 19)26- 12=

(20)50+38=

extreme

( 1)76-46= (2)50+3 1=

(3)47-26=

(4)9 1-45=

(5)98+30=

(6)96-57=

(7)93-72=

(8)25-2 1=

(9)42+ 10=

( 10)33-24=

( 1 1)70+28=

( 12)38-24=

( 13) 17+ 10=

( 14)29+26=

( 15)88+22=

( 16)83+37=

( 17)95+83=

( 18)38-29=

( 19)84-56=

(20)79+ 18=

Tisso

( 1)82+77= (2)86-52=

(3)9 1+ 15=

(4)6 1-4 1=

(5)37+ 14=

(6)76+20=

(7)66+39=

(8)99-77=

(9)78+54=

( 10)9 1+ 18=

( 1 1)27- 14=

( 12)90-25=

( 13)89- 17=

( 14)78+22=

( 15)43- 15=

( 16)24+2 1=

( 17)98-94=

( 18)65+22=

( 19)62-30=

(20)8 1+77=