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What happens when you add 10 to a number?
17 + 10 = ?
In this lesson you will learn to add 10 to a number by using ten-frames and a 100 chart.
Let’s Review
The ones number stays
the same.
Adding 10 to a number in the ones row
6 + 10 = 1610 + 6 = 16
Let’s ReviewSubtracting 10 from a
number in the ‘teens’ row
16- 10 = 6The ones
number stays the same.
Let’s ReviewPlace Value- tens and ones
5 ones2 tens 25
20 5 20 + 5 = 25
Let’s ReviewCounting by 10s
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Start at any number and
count by tens.
5, 15, 25, 35, 45, 55, 65, 75, 85, 95
Let’s ReviewCounting by 10s
100, 90, 80, 70, 60, 50, 40, 30, 20, 10
We can count backwards by
10.
95, 85, 75, 65, 55, 45, 35, 25, 15, 5
A Common MisunderstandingThose confusing ‘teen’ numbers.
14 41fourteen forty-one1 ten4 ones
4 tens1 one
They sound alike, but they are not the same.
Core LessonAdding 10 to a number
Plus 1017 + 10 = 27
10, 20, 21, 22, 23, 24,
25, 26, 27
Started with 17 and counted on 10.
Core LessonPlus 10
48 + 10 = 58
10, 20, 30, 40,50
8 more is 58
48
Core LessonPlus 10
48 + 10 = 58
It’s like skip counting by 10
48, 58
48
Core LessonPlus 10
35 + 10 = 45
30 + 10 = 4040 + 5 = 45
35
3 tens and 1 ten is 4 tens.
It’s 45.
Core LessonPlus 10
21,31The tens goes
up by 1.
21 + 10 = 31
21
Core LessonAdding 10 to a number
Start Number
End Number
17
31455827
48352152 ?62
Core Lesson10 More
13 + 10 24 + 1062 + 1076 + 1047 + 1059 + 10
Try these in your head.
Core Lesson10 More
13 + 10 = 23 24 + 10 = 3462 + 10 = 7276 + 10 = 8647 + 10 = 5759 + 10 = 69
Only the tens change.
Core Lesson What do you notice?When we add 10
• The ones stay the same.• The tens number goes
up by 1 ten.• On the 100 chart, the
end number is below the start number.
In this lesson you learned to add 10 to a number by using ten-frames and a 100 chart.