Remember: AND needs both parts to be true, OR needs at least one, and NOT flips true and false. Three small words build big rules.
Read and answer
Read the story, then answer.
The clubhouseZoe built a clubhouse with a secret door, and Bo was the door guard. Zoe's rule was: open only if the key is turned and the code is typed. Her little brother Max turned the key but typed no code, so the door stayed shut. Zoe added a doorbell with two buttons. The rule was: ring if the front button or the side button is pressed. Max pressed the side button and it rang. At dusk Zoe wanted the porch lamp to come on whenever it was not bright. Bo's light sensor answers just one question: is it bright? NOT flips the answer. At night the answer is no, NOT flips it to yes, and the lamp lights.
1
Look at the door rule. In how many of the four rows does the door open?
312
2
Look at the bell rule. In how many of the four rows does the bell ring?
314
3
OR is false only when both parts are false.
TrueFalse
4
NOT turns true into , and false into true.
falsebothone
5
In daylight, the sensor answers yes to is it bright? What does NOT bright give, and what does the lamp do?
💡No, so the lamp stays off🌙Yes, so the lamp lights🤷Nothing, because NOT does not change an answer
6
AND is true when only one part is true.
TrueFalse
Rules, order and fix
7
Join each word to what it does.
1AND
2OR
3NOT
Atrue when at least one part is true
Btrue only when both parts are true
Cflips true and false
8
Circle every rule that uses OR.
🍎Zoe has a snack if she is hungry or thirsty🔑Max may come in if he knows the code and has the key🔔The bell rings if the front or side button is pressed🌙The lamp lights if it is not bright
9
Max presses the side button. Put what happens in order.
The bell rings
The rule checks front OR side
One part is true
Max presses the side button
10
Zoe writes: open the door if the key is turned OR the code is typed. Max gets in with only the key. What is the mix-up to fix?
Change OR to AND, so both are neededChange the key to a bellChange OR to NOT
11
The table shows the sensor's answer to is it bright? on four evenings. The lamp rule is if NOT bright. On how many evenings does the lamp light?
421
12
Write one rule of your own that uses and, or, or not.
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