Using Complements in Addition

This video tutorial explains how to solve addition problems using complements of 10 and their multiples. It begins with an introduction to the concept of complements, emphasizing their role in forming groups of 10. The tutorial then demonstrates how to apply complements to solve both simple and complex addition problems, including word problems. By decomposing numbers and identifying complements, students can simplify calculations and improve their problem-solving skills.

What is the main idea behind using complements in addition?

• To make numbers look more interesting.

• To simplify addition by forming groups of 10.

• To confuse students with complex math.

• To create groups of 5.

Which pair of numbers is a complement of 10?

• 2 and 9

• 3 and 8

• 4 and 5

• 6 and 3

How can complements of 10 help in solving 40 + 60?

• By making the numbers smaller.

• By forming a group of 100.

• By adding them separately.

• By ignoring the tens place.

What is the result of 1,000 minus 800 using complements?

• 100

• 200

• 300

• 400

In the example 2,360 + 1,440, which numbers are complements?

• 2,000 and 1,000

• 300 and 400

• 40 and 60

• 6 and 4

How can you decompose 623 to find complements?

• 6 hundreds, 3 tens, 2 ones

• 6 ones, 2 tens, 3 hundreds

• 6 tens, 2 hundreds, 3 ones

• 6 hundreds, 2 tens, 3 ones

What is the missing number in 1,158 + 4,000 + ___ = 6,089?

• 1,100

• 800

• 900

• 1,000

How many calories did Joe consume if his lunch was 923 calories and dinner was 1,326 calories?

• 2,449

• 2,349

• 2,249

• 2,149

What is the benefit of using complements in word problems?

• It eliminates the need for subtraction.

• It helps in quickly finding sums.

• It makes the problem more complex.

• It reduces the number of steps.

When should you assess the use of complements in a problem?

• When the numbers are too large.

• When complements can be easily formed.

• When the problem is too simple.

• When you want to avoid using complements.