Wheat Flour
Flour
noun
Small wheat powder is wheat flour, or flour.
This word uses the kun'yomi readings of all three kanji. The 小 and the 粉 both use kun'yomi that you haven't learned yet, but luckily they are both the same! Just think about how "small" things are like 子 (こ), and "powder" is also small. So both 小 and 粉 are read こ.
お水の三倍の量の小麦粉を入れてください。
Add three times more flour than water.
これは小麦粉を練って作ったお菓子です。
This is a sweet that is made by kneading flour.
うわっ最悪。さっき買った高級小麦粉、電車に忘れちゃった。
Oh no. I left the expensive flour I just bought on the train.