1, the sum of nine eights.
Expressed as: 8+8+8+8+8+8+8+8 = 8× 9 = 72.
9 times that of 2 and 8.
Expressed as: 8×9=72
In 8 times 9 equals 72, 8 represents a factor; 9 also represents factors, and 72 represents products. Or 8 is the multiplier and 9 is the multiplicand.
Extended data
Significance of integer multiplication
1, a simple operation to find the sum of several identical addends. For example, "4+4+4+4" can be rewritten as "4×5" or written as "5×4".
2. In other words, "5×4" can mean "the sum of four five" or "the sum of five four".
Second, the multiplication name
"×" is a multiplication sign, the numbers before and after the multiplication sign are called factors, "=" is an equal sign, and the numbers after the equal sign are called products. A factor is also called a multiplier.
10 (factor) × (symbol) 200 (factor) = (symbol) 2000 (product)
Third, the algorithm of multiplication
1, multiplication commutation law
Multiplicative commutative law is the multiplication of two numbers, the position of the exchange factor, and their products are unchanged.
The letter expression is: a× b = b× a.
2. Multiplicative associative law
Multiply three numbers, the first two numbers are multiplied and then multiplied, or the last two numbers are multiplied and then multiplied, and the product remains the same.
The letter expression is: a×b×c=a×(b×c)
3. Law of Multiplication and Distribution
The sum (difference) of two numbers is multiplied by the same number. You can multiply the two addends (subtractions) by this number first, and then add (subtract) the two products, and the products remain unchanged.
The letter expression is: a× (b+c) = a× b+a× c.
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