Understanding Funny Numbers

What is the primary purpose of using funny numbers in subtraction?

• To make addition easier

• To simplify multiplication

• To improve division skills

• To aid in subtraction with regrouping

How can the number 45 be decomposed using funny numbers?

• Into 20 and 25

• Into 30 and 15

• Into 40 and 5

• Into 35 and 10

What is the first step in decomposing a three-digit number like 253 using funny numbers?

• Shifting a thousand

• Shifting a unit

• Shifting a ten

• Shifting a hundred

When decomposing 253, what is the result of shifting a ten?

• 240 and 13

• 220 and 33

• 250 and 3

• 230 and 23

Why is it important to build and verify decomposed numbers with cubes?

• To make the class more interactive

• To make the lesson more colorful

• To ensure the numbers still add up correctly

• To improve hand-eye coordination