Solving Addition Problems with Complements of 10 and Their Multiples

The video tutorial explains the concept of complements, focusing on complements of 10 and their multiples. It highlights their importance in the number system and demonstrates how they can simplify addition and subtraction problems. The tutorial includes examples of using complements in both simple and complex addition, as well as in word problems. It concludes by discussing the strategy's effectiveness and when it might be most useful.

What are complements of 10?

• Two numbers that subtract to 10

• Two numbers that divide to 10

• Two numbers that add up to 10

• Two numbers that multiply to 10

How can complements of 10 help in addition problems?

• By converting numbers to fractions

• By simplifying the addition to multiples of 10

• By forming groups of 5

• By making subtraction easier

What is the complement of 40 in the context of complements of 10?

• 70

• 60

• 30

• 50

In the problem 623 + 293, how can you use complements to simplify the addition?

• By subtracting 100 from each number

• By multiplying each number by 10

• By decomposing into hundreds, tens, and ones

• By adding directly

What is the result of 1158 + 4000 + 931?

• 6090

• 6091

• 6088

• 6089

How many calories did Joe consume if his lunch was 923 calories and dinner was 1326 calories?

• 2248

• 2251

• 2249

• 2250

What should you consider when deciding to use complements for solving problems?

• If the numbers are prime

• If the numbers are less than 100

• If complements can be easily made and are helpful

• If the numbers are even