Breaking down the multiplication problem can give us the answer.

分解这个乘式就能找到答案。

Sure, you immediately know it's a multiplication problem, and you knew you could solve it if you had the energy but didn't.

当然，你马上知道这是一个乘法问题，还知道如果你有精力你能算出它，但你没有解决它。

For example, instead of practicing 20 consecutive multiplication problems, mix it up with addition, subtraction, and division problems.

例如，与其练习 20 个连续的乘法题，不如将其与加法、减法和除法题混合起来。