For example, the calculation: 2 2 = 6, and the multiplication is: 2? × 3 = 6 or 3? × 2 ? = 6
1. Writing and reading of multiplication formula: the method of rewriting continuous addition formula into multiplication formula. Find the sum of several identical addends, which can be calculated by multiplication. When writing a multiplication formula, you can write the same addend first, then the multiplication symbol, then the number of the same addend, and finally the equal sign and the addition.
You can also write the number of the same addend first, then write the multiplication symbol, then write the same addend, and finally write the sum of equal sign and continuous addition. For example: 2 2 = 6, rewritten as a multiplication formula, read: 3 times 2 equals 6.
2. How to read the multiplication formula? When reading multiplication formulas, read them in the formula order. For example, 6×3= 18 is read as "6 times 3 equals 18".
3. The names and practical significance of each part in the multiplication formula. In the multiplication formula, the number before multiplication and the number after multiplication are called "multipliers"; The number after the equal sign is called the product.
4. The multiplication formula means to find the sum of several identical addends, and it is relatively simple to calculate by multiplication. The multiplication formula represents the sum of several identical addends. For example, 4×5 means five 4+ s or four 5+ s..
When addition is written as multiplication, the sum of addition is equal to the product of multiplication. In the multiplication formula, two multipliers exchange positions and the product remains the same.
6. Names and calculation formulas of each part of the formula. Multiplier × Multiplier = Product
7. In the multiplication formula of 9, 9 multiplied by 9 or 9 multiplied by several can be regarded as tens minus several, where "several" refers to the same number. Such as: 1×9= 10- 1? 9×5=50-5
8. There is a difference between "several plus" and "several plus". Ask for a few more, use a few more; What is the sum of 4 and 3? Find several sums by addition (4 3 = 7) and multiply them by several times. What is the sum of four threes? (3 33 =12 or 3×4= 12 or 4×3= 12) Supplement: What are multiplication and quadrature?
Multiply by several times several times. For example, 2 plus 4 times 2×4=8, what are the two multipliers? Use it a few times. For example, two eights multiplied by 8×8=64.
9. A multiplication formula can represent two meanings. For example, "4×2" can represent "four additions" or "two four additions". The multiplication formula of "5 5 5" is (3×5= 15) or (5×3= 15), both of which can be calculated by formula (35 15), that is, (3) (5) plus 3× 5 =/kloc.
10, add any number and 0 to get the original number. Multiply 1 by any number to get the original number. Any number multiplied by 0 equals 0.