Math Strategies and Properties

The video tutorial teaches how to choose appropriate strategies for explaining addition and subtraction problems. It highlights the importance of explaining math solutions for various reasons, such as proving correctness, comparing strategies, and teaching others. The tutorial covers different methods like using place value, fact families, and properties of addition. It provides guidance on selecting the best strategy based on the problem's numbers and includes example problems to illustrate these concepts.

Why is it important to explain your math strategy to others?

• To prove your correctness and learn from others

• To avoid doing homework

• To confuse your classmates

• To show off your skills

Which strategy involves breaking numbers into tens and ones?

• Drawing pictures

• Using a calculator

• Place value strategy

• Guessing the answer

How can you prove that 95 minus 61 equals 34 using addition?

• By adding 61 and 34 to get 95

• By subtracting 34 from 95

• By multiplying 61 and 34

• By dividing 95 by 34

What does the commutative property of addition state?

• Numbers can only be added in pairs

• Numbers must be added in a specific order

• Numbers can be added in any order

• Numbers cannot be added

What is the benefit of using the associative property in addition?

• It allows you to group numbers for easier addition

• It makes subtraction easier

• It helps in multiplication

• It is used for division

In the tables example, what strategy did the monkey use to explain his solution?

• Guessing the answer

• Using place value

• Drawing a picture

• Using a calculator

How many tables still need flowers if 17 out of 48 tables have flowers?

• 31 tables

• 17 tables

• 48 tables

• 65 tables

In the popcorn boxes example, what was the total number of boxes needed?

• 82 boxes

• 43 boxes

• 39 boxes

• 100 boxes

What strategy did the monkey use to explain the popcorn boxes problem?

• Using a number line and breaking numbers

• Guessing the answer

• Using a calculator

• Drawing a picture

Why is the number 39 considered close to 40 in the popcorn boxes example?

• Because it is a round number

• Because it is easier to add to tens

• Because it is a prime number

• Because it is a multiple of 5