Place value in two-digit numbers When you are solving an addition calculation with a two-digit number, you need to think about tens and ones.

For decades, educators have assumed that learning arithmetic in school helps students solve real-world problems. Yet, a new ...

Miss James needs your detective skills to solve some addition and subtraction problems.

Miss White teaches you how to complete formal addition problems without regrouping.

We get the same final digit, which tells us that 218 plus 435 is almost certainly 653. This technique works for any addition or multiplication problem, and it technically works for any subtraction ...