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学习了乘法,我们知道:乘法就是求几个相同加数的和的一种简便计算。根据这个道理,我们可以把加数相同的加法算式改写成乘法算式。例1:把下面的加法算式改写成乘法算式。(1)4+4+4(2)5+5+5+5分析与解(1)把4+4+4改写成乘法算式是:4×3或3×4(2)把5+5+5+5改写成乘法算式是:5×4或4×5在不改变相加结果的前提下,如果能把不同的加数“变化”为相同的加数,那么,还可以把这些有特点的加法算式改写成乘法算式,这样就可以用乘法来进行简便计算。例2:把下面的加法算式改写成乘法算式。
Learning multiplication, we know: multiplication is to find a few simple calculation of the sum of the same. Based on this principle, we can rewrite the addition of the same number of additions as a multiplication formula. Example 1: Rewrite the following addition formula as a multiplication formula. (1) 4 + 4 + 4 (2) 5 + 5 + 5 + 5 Analysis and Solution (1) Rewriting 4 + 4 + 4 as a multiplication formula is: 4 × 3 or 3 × 4 +5 +5 Rewritten as a multiplication formula is: 5 × 4 or 4 × 5 Without changing the result of the addition under the premise, if the different addend “change ” for the same addition, you can also put These distinctive addition formulas are rewritten into multiplication formulas so that multiplication can be used to make simple calculations. Example 2: Rewrite the following addition formula as a multiplication formula.