: Units under units, tens under tens, hundreds under hundreds.
4th-grade word problems often require two or more steps to solve. Teach your child to use this algorithm: twice and underline the keywords. : Units under units, tens under tens, hundreds
: When adding, if the sum is 10 or more, carry over to the next place value. : Units under units
: When subtracting, if the top digit is smaller than the bottom, borrow from the left. tens under tens