3-9 True or False Number
Sentences
 Using your whiteboards write me a number sentences
that is TRUE, and label it so.
 Then write one that is FALSE, and label it so.
3-9 True or False Number
Sentences
 Let’s make a chart as a class.
TRUE
FALSE
UNSOLVABLE
3-9 True or False Number
Sentences
 Help me write each sentence in a different way.
 The sum of five and eight is equal to thirteen.
 5<7
 25-15>3
 The ones with words are number sentences
 The ones with numbers are shorthand sentences
3-9 True or False Number
Sentences
 Sometimes the symbols can be easier to understand
rather than words.
 Determining whether a number sentence is true or
false.
 4*5=20

Is this correct?
3-9 True or False Number
Sentences
 That was a true number sentence
 What about this?

(4*5) * 8 = 20 * 8
3-9 True or False Number
Sentences
 That was also true.
 Any true number sentence will remain true if it has an
equal sign, and you make the same action on both sides
of it.
 If you multiply equals by equals you get equal quantities.
 If you add equals to equals you get equal quantities.

(4*5) + 10 = 20 + 10
3-9 True or False Number
Sentences
 12/4=4
Is this true?
 No – this is a false number statement.
 For the next slide, I will have a list of problems, you
need to help me determine if they are true or false.
3-9 True or False Number
Sentences
 15 + 13 = 28
8=5*3
 42 – 12 = 20
 17 < 27
 3 = 18 / 6
3-9 True or False Number
Sentences
 Let’s get a little trickier:
 716 – 487 = 616 – 487
 4,684 + 182 > 4,684 + 482
 42 + _____ = 50
8*6
3-9 True or False Number
Sentences
 Let’s work through it in groups on page 69 of your
math journal.
 Do numbers 1 – 8 on your own and check with a desk
partner
 Each partner does on true and one false for number 9
 Each partner will make all 6 sentences and have their
partner answer the TRUE or FALSE part to check. 
3-9 True or False Number
Sentences
 Homework 3-9 page 94 From Miss Mendon