Diandian hummed softly towards Xingxing, "Brother Qingming is still the best. Unlike that brother who looked down on me for being stupid after helping me with two questions!"
Song Qingming stretched out eight fingers and said, "We also went through this stage."
Xingxing silently complained in his heart that he had never used his fingers when doing addition and subtraction in the first grade.
My sister is just a little bit stupid.
Diandian finished her homework, quickly closed her book, put her pencils in her pencil case, and stuffed the book and pencil case into her schoolbag. She was about to play with her younger brothers and sisters, but was stopped by Song Qingming.
"What's wrong with Brother Qingming?"
"I can teach you a simpler and easier way to solve the problem."
"Is it a math problem?"
"Yes."
"Then let me listen."
"But first you have to memorize all the numbers that add up to ten. For example, one plus nine equals ten, two plus eight equals ten, three plus seven equals ten, four plus six equals ten..."
"I know this. Ten is the easiest number to calculate."
"Now that you know, we can learn a new method now." Song Qingming took out his notebook, opened a blank piece of paper, and used a ballpoint pen to casually write nine plus six on it.
Diandian subconsciously wanted to count out nine fingers, but Song Qingming immediately stopped her, "No need to count your fingers, just follow my train of thought, nine plus what equals ten?"
"Nine plus one equals ten!" Instant reply!
"Okay, then we'll help Nine borrow a one from Six. How many are left in Six now?"
"Five more."
"What's nine plus one?"
"Of course it's ten."
"Ten plus the remaining five equals what?"
"Fifteen~"
After saying that, Diandian was stunned. "This is so easy! Brother Qingming, you are so awesome!"
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