Sun Xiuxiu looked at them for a long time, then whispered, "They are all divisible by 9."
"Yes, Xiuxiu, let's look at these numbers separately again and see if there's a pattern in their sums."
Xiuxiu suddenly exclaimed, "They all add up to 9!"
"Xiuxiu is so smart. This is the little secret to this problem: if a number is divisible by 9, then the sum of all the digits of the number must be a multiple of 9."
"Now we know that: hundreds digit + units digit = 10, then hundreds digit + tens digit + units digit = 10 + tens digit."
For the sum to be a multiple of 9, then 10 + the tens digit must be 9, 18, 27, etc.
However, the tens digit can only be 0 to 9, so 10 plus the tens digit is at most 10+9=19, and only 18 meets the condition.
If we fill in the tens place with 8, how many numbers are there in total?
Xiuxiu counted them and said, "There are 9."
"Yes, there are nine. So, will Xiuxiu be able to solve these kinds of questions in the future?"
Xiuxiu nodded and said, "Thank you, Auntie."
Jiang Xuan patted her head. "You're welcome."
Ma Xiaolan walked over and said with a smile, "Jiang Xuan, you're amazing! I looked at it for ages and still couldn't figure it out."
"It's alright, Sister Lan. Xiuxiu can ask me anytime if she has any questions she doesn't understand."
"Okay, okay, I'll go do the laundry then."
Xiuxiu was about to leave when Jiang Xuan said, "Xiuxiu, could you help Auntie with something?"
Before Xiuxiu could speak, Ma Xiaolan smiled and said, "Sure, sure, of course. Just tell her what you need her to do."
"Auntie, what do you need me to do?"
"I drew a picture and I need Xiuxiu to help me color it, is that okay?"
Xiuxiu nodded.
Jiang Xuan led Xiuxiu into the bedroom, then told her which area to paint which color and marked it with colored pens.
"Xiuxiu, I remember your mom said your birthday is coming up soon, what day is it?"
"tomorrow."
"So what's your birthday wish?"
Xiuxiu shook her head.
"It's okay, you can just tell Auntie quietly, and Auntie won't tell anyone."
"I wish to receive a book of Hans Christian Andersen's fairy tales."
"Is this all? Don't you want new clothes and new shoes?"
Xiuxiu applied the color without saying a word.
"Xiuxiu, Auntie can sew clothes. Auntie wants to make you a dress. What kind do you want?"
"Thank you, Auntie, but I can't accept this."
Why?
"Because Auntie also needs to spend money to buy fabric."
Oh dear, this little girl is so sensible it breaks my heart.
Jiang Xuan pulled her up, touched her face, and said, "It's okay. Auntie likes Xiuxiu, so I wanted to make a dress for Xiuxiu too. Let Auntie make you a princess dress."
As she spoke, she took out a soft measuring tape and began to measure Xiuxiu's body dimensions.
She not only wanted to make one for Xiuxiu, but also for Sister Lan. Tomorrow, she was going to take the mother and daughter shopping to give Xiuxiu a different kind of birthday celebration.
Jiang Xuan drew a simple diagram on the paper, then adjusted the details, and began to draw lines and cut the fabric.
She chose white.
Xiuxiu colored very carefully. By the time she finished, Jiang Xuan had already cut out the clothes and started operating the sewing machine.
"Thank you, Xiuxiu. There are bookshelves in Diandian and Fanxing's room. You can go and see if there are any books you like to read?"
Xiuxiu was naturally very happy to be able to read.
When people get busy, time seems to grow legs.
She felt like it hadn't taken long, but when she checked the time after finishing the dress, more than three hours had passed.
And Xiuxiu really did read for more than three hours.
Jiang Xuan went to the restroom and came back. "Xiuxiu, you need to rest for a few minutes after reading for half an hour, otherwise your eyes will easily become nearsighted."
Xiuxiu said a little shyly, "This book about the mermaid is so good."
"Take your time, there's no rush. Auntie has already finished making the dress, come and try it on."
Xiuxiu had never worn such a beautiful dress before; it had puff sleeves, a three-layered hem, and a bow at the waist.
Jiang Xuan was quite satisfied. "Xiuxiu, turn around, Auntie will look behind you."
Both are very good.
She had already told her younger sister about picking up Dot Dot Star this morning, so there was no need to rush to pick up the child now.
She planned to cut out Lan Jie's clothes as soon as possible.
*
When Xiuxiu returned home, Ma Xiaolan was tidying up the house.
Seeing her daughter wearing such a beautiful dress, Ma Xiaolan was stunned for a long time.
"Xiuxiu, where did you get this dress?"
"Aunt Hyun made it for me."
Ma Xiaolan quickly ran over and said, "Oh my, Jiang Xuan, why are you making a dress for Xiuxiu? It has three layers, how much fabric does that take?"
Jiang Xuan watched the sewing machine work and said, "Sister Lan, please stop saying these things. Xiuxiu is a young girl, so she should be dressed up nicely. Besides, tomorrow is Xiuxiu's birthday. What's wrong with me giving her a gift?"
"Thank you, Jiang Xuan."
"Not just Xiuxiu, Sister Lan, you need to get dressed up too. I'm doing it for you now, it'll be done in about two hours."
"Huh? I don't want it, Jiang Xuan, don't waste the cloth."
"Let's not waste any time. Tomorrow, the three of us will dress up nicely and celebrate Xiuxiu's birthday."
Ma Xiaolan's nose tingled, and she couldn't help but wipe her eyes.
Tomorrow is Xiuxiu's birthday, but apart from her, it seems that no one in the family cares about it.
They were even discussing going to their eldest son's house tomorrow to see their eldest grandson.
"Don't be sad, Sister Lan. Things will get better."
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