Multiplication — Chapter Summary

We multiply step by step

We multiply step by step — first by the ones digit, then by the tens digit (after placing a zero). Finally, we add both results. For example, to multi

There are special rules

There are special rules: (1) Any number × 1 = the number itself. (2) Any number × 0 = 0. (3) Order doesn’t matter — 5 × 3 = 3 × 5 (Commutative Propert

To multiply by 10

To multiply by 10, add one zero at the end. For 100, add two zeroes. For 1000, add three zeroes. For example: 45 × 10 = 450, 45 × 100 = 4500, 45 × 100

We can multiply 4

We can multiply 4-digit or 5-digit numbers by 2-digit or 3-digit numbers using the column method. We multiply each digit one by one, shift left with z