Lesson 1 Part 1(EXAMPLE 1-3)
Hello!
I am Jacky, and today, I am going to teach you OM!
Let's start!
Example 1:①36+87+64②99+136＋101③ 1361＋972＋639＋28
Let's look at the first one: 36+87+64 See that 36+64=100? Then, we can scramble the numbers:36+64+87 Then add!Answer:187 The second one, 99+136+101, is scrambled to 99+101+136=200+136=336 See if you can try one the third one!
Example 2:①188＋873 ②548＋996 ③9898＋203 Hmm, nothing add up to"easy groups"? Or is it? 188+273, actually is (200-22)+273. Take out brackets, and scrambled them(don't forget to move them along the + and -) Becomes:200+273-22=473-22=451. The next one:996 is 1000-4. Scrambled it becomes:548+1000-4=1548-4=1544. See if you can try out the third!
Example 3:① 300-73-27② 1000-90-80-20-10 Hmmm, all subtracted... But wait, look at this:a-b-c=a-(b+c) !!!!!!! Now it's easy! 300-73-27 is 300-(73+27) is 300-100 is 200! The next one t=is yours!
Earn a badge for completing: 1.Write the problems. The problems are in the examples's last problem. 2.Summarize what you learned today.
Bye!!!!