Complete the following exercise:
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Complete the following exercise:
Let's remember the rule:
Therefore, the sign of the exercise result will be positive:
21
What will be the sign of the result of the next exercise?
\( (-2)\cdot(-4)= \)
Because multiplication means repeated addition! When you multiply 7 × 3, you're adding 3 seven times: 3 + 3 + 3 + 3 + 3 + 3 + 3 = 21. Or you can think of it as adding 7 three times: 7 + 7 + 7 = 21.
Practice with skip counting! Count by 3s: 3, 6, 9, 12, 15, 18, 21. The 7th number is 21, so 7 × 3 = 21. You can also use multiplication tables or flashcards for daily practice.
No, it doesn't matter! This is called the commutative property of multiplication. Both 7 × 3 and 3 × 7 equal 21. The order doesn't change the answer.
Don't panic! You can always use repeated addition: add 3 seven times (3+3+3+3+3+3+3) or add 7 three times (7+7+7). Both methods will get you to 21.
The × symbol is a mathematical shorthand that saves time and space. It means exactly the same thing as writing 'times' but makes equations cleaner and easier to read.
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