Explaining Subtraction with Addition

The video tutorial teaches how to explain subtraction using addition. It emphasizes the importance of explaining math problems to prove correctness, compare strategies, and help others understand. The tutorial uses examples involving pineapples and watermelons to demonstrate how subtraction can be explained through addition, using methods like number lines and base 10 blocks. The concept of fact families is introduced to show the relationship between addition and subtraction.

Why is it important to explain your math solutions?

• To confuse others

• To make math more difficult

• To prove correctness and learn new strategies

• To show off your skills

What is a fact family in mathematics?

• A set of numbers showing their relationship through operations

• A group of unrelated numbers

• A family that loves math

• A collection of random equations

How can you verify a subtraction problem using addition?

• By subtracting the same numbers again

• By dividing the numbers

• By multiplying the numbers

• By adding the difference to the smaller number to get the larger number

What method did the monkey use to solve the pineapple problem?

• He asked a friend

• He used a calculator

• He guessed the answer

• He used a number line and place value blocks

How many pineapples were left after the cooks used some?

• 95

• 34

• 61

• 23

What was the initial number of watermelons in the refrigerator?

• 59

• 82

• 23

• 95

How did the monkey prove the watermelon problem solution?

• By drawing a picture

• By asking the teacher

• By using a number line and base 10 blocks

• By using a calculator