3-9 True or False Number
Sentences
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
3-9 True or False Number Sentences
• Homework 3-9 page 94 From Miss Mendon