Addition and Subtraction with Regrouping Flashcards

Grade 3 · Math · Flashcards

Key terms, rules, and practice problems for regrouping in addition and subtraction.

Flashcards

Regrouping: Reorganizing numbers by trading 10 of one unit for 1 of the next larger unit.
Carrying (addition): When ones add up to 10+, write the ones digit and move the ten to the tens column.
Borrowing (subtraction): Taking 1 from the tens column and adding 10 to the ones column when you need more to subtract.
27 + 45 = ?: 72 (7+5=12, carry 1; 2+4+1=7)
61 − 38 = ?: 23 (borrow: 11−8=3; 5−3=2)
54 + 67 = ?: 121 (4+7=11, carry 1; 5+6+1=12, carry 1; write 1)
100 − 43 = ?: 57 (borrow chain from hundreds)
When do you regroup in addition?: When any column's digits add up to 10 or more.
When do you regroup in subtraction?: When the top digit in a column is smaller than the bottom digit.
38 + 54 = ?: 92 (8+4=12, carry 1; 3+5+1=9)
82 − 35 = ?: 47 (borrow: 12−5=7; 7−3=4)
Ones place: The rightmost digit — represents single units.
Tens place: Second from right — represents groups of 10.
Hundreds place: Third from right — represents groups of 100.
115 + 78 = ?: 193 (5+8=13, carry 1; 1+7+1=9; 1+0=1)
143 − 67 = ?: 76 (borrow: 13−7=6; 3−6? borrow: 13−6=7; 0 left)