Page 27 - TG_G1_CH6_CHRIS

6 - 4 Add Tens
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: Build 2 towers of red cubes and 1 tower of green cubes. Each tower
and strategies based on place value, should have 10 unifix cubes. Ask: How many towers of cubes are there in all? How
properties of operations, and/or the many cubes are there in all?
relationship between addition and 3 towers of cubes
subtraction; relate the strategy to 30 cubes in all.
a written method and explain the
reasoning used. Understand that in
adding two-digit numbers, one adds Reteach
tens and tens, ones and ones; and
sometimes it is necessary to compose
a ten. Time: 10 minutes
Objective INDIVIDUAL

Add a multiple of 10 using place Material: pictures of clusters of 10 grapes
value chart and models. Instruction: Give a child two pictures. One contains one cluster of grapes and the
other contains two clusters. Say: Color the grapes in the two pictures
Essential Question and find the total number of grapes in the two pictures altogether.

How can I add tens?
20 + 30 = ___
2 tens and 3 tens are 5 tens = 50 10 + 20 = 30

Ready to Go

Say: In the last lesson you studied
counting tens, today you will study
adding tens. Enrich

Time: 10 minutes
INDIVIDUAL

Material: string, beads
Instruction: Give children 2 necklaces of 10 beads each. Provide an additional string
and beads to make 3 necklaces. Ask: How many beads are in the first 2 necklaces?
How many beads are used in the other 3 necklaces? How many beads in all?
Possible answer:
The first two necklaces have 20 beads.
The other 3 necklaces have 30 beads.
The number of beads in all is 50 beads.

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