Page 33 - TG_G1_CH6_CHRIS

6-5 Add Tens and Ones
WARM-UP

On Level

Standard
1.NBT.C.4. Add within 100, including Time: 10 minutes
adding a two-digit number and a
one-digit number, and adding a two- WHOLE CLASS
digit number and a multiple of 10, Material: Cubes
using concrete models or drawings Instruction: Hand out 13 white cubes and 4 black cubes to each child. Say: Count
and strategies based on place value, the number of white cubes. Try to make a tower of 10 white cubes. Now combine
properties of operations, and / or the rest of the white cubes with the black cubes. How many cubes are there in all?
the relationship between addition 17
and subtraction; relate the strategy Discuss how children found the answer by making
to a written method and explain the 10. Have children suggest other ways
to solve the problem.
reasoning used. Understand that in
adding two-digit numbers, one adds
tens and tens, ones and ones; and
sometimes it is necessary to compose
a ten. Reteach
Objective

Add tens and ones using the place Time: 10 minutes
value chart and models INDIVIDUAL
Material: cubes
Essential Question Instruction: Give each child 25 cubes. Say: Make towers of ten cubes. Ask: How

How can I add ones to a two-digit many cubes are left over?
5
number?
Ex: 85 + 2 = ____ add the ones
together then add tens.
5 + 2 = 7 Enrich
80 + 7 = 87
Ready to Go Time: 10 minutes

Say: Last lesson you studied add tens,
today you will learn add tens and INDIVIDUAL
ones. Material: cubes
Instruction: Give children 13 white cubes and 8 black cubes. Ask: How many white
and black cubes do you have in all? Have children complete the diagram.
Then ask him to complete:

13 + 8 = 10 + 3 + 8 =10 + 3 + 7 + 1 = 10 + 10 + 1 = 21 cubes

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