Subtracting by Counting Up to Ten

The video tutorial teaches subtraction by using friendly numbers, such as tens, to simplify calculations. It begins with an introduction using marbles and explains the concept of friendly numbers. The tutorial clarifies common misunderstandings about the order of subtraction and demonstrates how to use friendly numbers to make subtraction easier. Through examples, it shows how to subtract by counting up to a ten, making the process more intuitive. The lesson concludes with a summary of the key points covered.

What is a friendly number in the context of subtraction?

• A number that is always even

• A number that is always odd

• A number that is easy to subtract from

• A number that is easy to add

Which of the following is a common misunderstanding in subtraction?

• Subtracting numbers in any order gives the same result

• Subtracting numbers requires multiplication

• Subtracting smaller numbers is always easier

• Subtracting larger numbers is always harder

How can you simplify the subtraction of 9 minus 6?

• By subtracting 2 from 6

• By adding 2 to both numbers

• By subtracting 1 from both numbers

• By adding 1 to 9 to make it 10

What is the result of 18 minus 6 using friendly numbers?

• 10

• 12

• 14

• 16

If Zim had 19 marbles and gave 6 to Lily, how many does he have left?

• 11

• 12

• 13

• 14