Addition to 1,000

Addition through 1,000

Addition to 1,000 without crossing tens or hundreds

Addition to 1,000 crossing hundreds

Addition to 1,000 crossing tens

Addition to 1,000 with multiples of ten

Addition to 1,000 with crossing tens and hundreds

Addition to 1,000 using standard algorithm with regrouping

Addition to 1,000 via compensation method

Addition to 1,000 with one more or one less

Addition to 1,000 via simplification

Addition to 1,000 with three or more random numbers

Addition to 1,000 by splitting the second addend

Addition to 1,000 using grouping with three or more addends

Addition to 1,000 by splitting the second addend into hundreds, tens, and ones

Addition to 1,000 with three or more simple numbers

Addition to 1,000 by counting, with hundreds and tens

Addition to 1,000 by counting, with hundreds

Addition to 100 with the zero-rule