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MTH 085 – BASIC MATHEMATICS CLASS 8: LECTURE NOTES – SECTION 1.4 1.4: MULTIPLYING WHOLE NUMBERS Basic Terminology ____________________ is simply repeated addition. For example, we can rewrite 5 + 5 + 5 + 5 = ___________ = _____. Remember: ____________________ × _____________________ = ______________________ A number is written in ____________________, when it is written as a product of factors. For example, 20 = __________, ___________, ___________ When a & b are two whole numbers, their product a · b, is both a ____________________ of a and of b. For example, the multiples of 5 are: ______________________________________________________ (Hint: Each row of a multiplication table lists the first few multiples of that number.) X 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 MTH 085 – BASIC MATHEMATICS CLASS 8: LECTURE NOTES – SECTION 1.4 Types of Properties 1. Commutative (from 1.2): _________________________________________________________ 2. Associative (from 1.2): ___________________________________________________________ 3. Identity (from 1.2): ______________________________________________________________ 4. The multiplication property of zero: ________________________________________________________________ Example (with numbers) Example(with letters) - - __________________________ _____________________________ 5. The distributive property of multiplication over addition: ________________________________________________________________ Example (with numbers) Example(with letters) - - __________________________ Today’s Examples 1. Multiplying one-digit by two-digit factors 2. Multiplying one-digit by many-digit factors _____________________________