Fact Families and Function Machines

The video tutorial covers various math concepts including function machines, counting back strategy for subtraction, deciding when to add or subtract in problems, understanding fact families, solving word problems, and counting seashells. Each section provides practical examples and strategies to help students grasp these concepts effectively.

What is the rule for the green function machine if the input is 4 and the output is 8?

• Add 4

• Add 5

• Subtract 2

• Add 3

If you start with 10 and end with 3 in the orange function machine, what operation should you perform?

• Add 7

• Subtract 7

• Subtract 8

• Add 8

In the counting back strategy, how many fingers should you hold up when solving 13 minus 7?

• 4

• 5

• 6

• 7

Using the counting back strategy, what is the result of 17 minus 11?

• 5

• 8

• 6

• 7

If the first number is smaller than the last number in a problem, what operation should you use?

• Divide

• Multiply

• Subtract

• Add

In the problem 16 plus or minus 7 equals 9, which operation should be used?

• Add

• Divide

• Multiply

• Subtract

Which of the following equations belongs in the fact family with numbers 10, 7, and 3?

• 3 + 10 = 13

• 10 + 3 = 7

• 7 + 3 = 10

• 10 - 7 = 4

In a fact family with numbers 14, 8, and 6, which equation is correct?

• 8 - 6 = 2

• 14 + 6 = 20

• 8 + 6 = 14

• 14 - 8 = 5

Alex took 12 pictures at the monkey house and 28 at the polar display. If he used 18 in his album, how many did he not use?

• 22

• 26

• 24

• 20

If there are 340 blueberry muffins and 250 strawberry muffins, and 500 are eaten, how many are left?

• 110

• 100

• 90

• 80