Add and Subtract Within 1000 - 3rd Grade Math

$548 - 200 = 348$. Addition and subtraction are inverse operations; swap sum and addend.

$800$. Add ones: $5+5=10$ (carry 1), tens: $7+2+1=10$ (carry 1), hundreds: $4+3+1=8$.

$549$. No regrouping needed: subtract each place value directly.

$444$. Regroup tens: $602=5$ hundreds $9$ tens $12$ ones, then subtract.

$624$. Add with regrouping: $6+8=14$ (carry 1), $4+7+1=12$ (carry 1), $2+3+1=6$.

$425$. Regroup $900$ as $8$ hundreds $9$ tens $10$ ones, then subtract place by place.

$600$. Add ones: $9+1=10$ (carry 1), tens: $8+1+1=10$ (carry 1), hundreds: $3+2+1=6$.

$232$. Regroup from hundreds: $700=6$ hundreds $9$ tens $10$ ones, then subtract.

$424$. Subtract ones: $8-4=4$, tens: $5-3=2$, hundreds: $6-2=4$.

$803$. Add with regrouping: $7+6=13$ (carry 1), $0+9+1=10$ (carry 1), $5+2+1=8$.

$492$. Add ones: $8+4=12$, carry 1; tens: $6+2+1=9$; hundreds: $3+1=4$.

$70$. The digit 7 is in the tens place, representing 7 tens.

$415$. Regroup from tens: $810=8$ hundreds $0$ tens $10$ ones, then subtract.

$533$. Find what adds to 367 to make 900: $900-367=533$.