Lesson 3.  Add and subtract multiples of 10 and some ones within 100.

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Presentation transcript:

Lesson 3

 Add and subtract multiples of 10 and some ones within 100.

 2 tens less than 6 tens. 4 tens.  Subtraction number sentence? 60–20=40.  2 tens less than 6 tens 8 ones. 4 tens 8 ones.  Subtraction number sentence? 68–20= – 2373 –

 Sprint A On your mark, get set, THINK  Sprint B On your mark, get set, THINK

 Terrell puts 19 stamps in his book on Monday. He puts in 32 stamps on Tuesday. How many stamps does Terrell put in his book?  If Terrell’s book holds 90 stamps, how many more stamps does he need to fill his book?  Use mental math, arrow notation, or number bonds to solve.  Share!

Students will need personal white boards  ? Show me.  ? Show me.  ? Talk with your partner.  Who would like to share?  48+19?  We can solve 48+21and using to help us.

 From 20 to 21 is one more or one less? 1 more.  From 20 to 19 is one more or one less? 1 less.  Adding 21 is adding one more than 20.  Adding 19 is adding one less than 20.

 Solve the following problems on your white board and share your thinking with your partner , 36+51, , 27+61, , 43+22,  Pair-share and explain your strategies.

 Let’s try this with subtraction. What is 68 – 20? Show me using the arrow way.  Talk with your partner. Solve 68 – 21, using 68 – 20 to help you.  Solve 68–19,using 68–20 to help you.

 Solve the following problems on your white board and share your thinking with your partner. 57–30, 57–31, 57–29 63–40, 63–41, 63–39 72–50, 72–51, 72–49  Let’s discuss our findings.  To subtract 31, we are subtracting one more. To subtract 29, we are subtracting one less than 30, so we add one to the result of 68 – 20.