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Add Tens and Ones
• Use the 100 chart to add each number inside the ball to the number inside Say: Use the 100 chart to add each number inside the balls to the number
the tennis racket.
• Color the sum. inside the tennis racket. Then, color each sum.
4 1 5 7 9 Tell children that to add 1 ten, they have to move down one step. To add 20.
8 They will move down 2 steps.

2 1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 Ask : How do you use the chart to find the sum?
21 22 23 24 25 26 27 28 29 30 I started from the number on the ball on the chart then I moved 2 steps down
31 32 33 34 35 36 37 38 39 40
6 41 42 43 44 45 46 47 48 49 50 to add 20
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
3 81 82 83 84 85 86 87 88 89 100
90
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ANCHOR ACTIVITY
20 Use the Anchor Activity for this lesson as a warm-up to gauge
children’s prior knowledge and help them engage at the
beginning of class.
1.NBT.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of
10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship
between addition and subtraction, relate the strategy to a written method and explain the 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.
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TIME TO LEARN
TIME TO LEARN

Review the addition concept and ensure that they can add numbers up to
30 + 6 = 36 52 + 5 = 57 20 using different strategies. Write 30 + 6 on the board. Encourage children to
model both addends using base ten blocks for the tens and cubes for the
Tens Ones Tens Ones
3 0 5 2 ones. Ask: How many base ten blocks do you have? 3 How many cubes do
+ 6 + 5 you have? 6
3 6 5 7 Draw a place value chart
Ask: What does the 3 stands for? Tens What does the 6 stands for? Ones
STEP What is the sum of 30 and 6? 36 Write 52 + 5 = on the board. Say: Model 52 and
BY
STEP Add. 5 using base ten rods and unit cubes, how many base ten rods do you have
1 in all? 5 How many unit cubes do you have in all? 7 What is the sum of 52 + 5?
1 90 + 8 = 98 4 63 + 2 = 65
57 Provide children with a place value chart and encourage them to use the
chart to find the sum of 52 + 5 . Remind them that they have to start adding
2 6 + 60 = 66 5 7 + 22 = 29 with the ones place and then add the tens place. Ensure that children always
start with the ones place when adding numbers.
3 Tens Ones 6 Tens Ones
8 0 3 4
+ 5 + 5
Common
8 5 3 9 Common
Errors
Errors
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Children may write the digits in the wrong place in the place value
chart. They may write tens in the ones column or, more likely the ones in
the tens column, column by mistake.

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