Add and Subtract Within 100 - 2nd Grade Math

$26$. Regroup: $83-57 = 73+10-57 = 26$.

$44$. Regroup: $92-48 = 82+10-48 = 44$.

$46$. Subtract ones: $2-6$ needs regrouping; $12-6=6$, $4-0=4$.

$75$. Add ones: $7+8=15$, carry 1; add tens: $2+4+1=7$.

$64$. Add ones: $9+5=14$, carry 1; add tens: $2+3+1=6$.

$65$. Add ones: $8+7=15$, carry 1; add tens: $5+1=6$.

$44$. Regroup: $71-27 = 61+10-27 = 44$.

$44$. Subtract: $90-46 = 90-40-6 = 50-6 = 44$.

$72$. Add ones: $7+5=12$, carry 1; add tens: $4+2+1=7$.

$64$. Add ones: $6+8=14$, carry 1; add tens: $3+2+1=6$.

$43$. Add ones: $4+9=13$, carry 1; add tens: $3+1=4$.

$64$. Add ones: $5+9=14$, carry 1; add tens: $4+1+1=6$.

$42$. Subtract: $70-28 = 70-20-8 = 50-8 = 42$.

$74$. Add ones: $6+8=14$, carry 1; add tens: $5+1+1=7$.