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Year 1 Maths

Counting to 100

Let's count all the way to 100! We will count forwards, count backwards, and skip count by 2s and 5s.

The Hundred Chart

A hundred chart shows all the numbers from 1 to 100. Each row has 10 numbers. Can you read across each row?

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Count by 10s
Count by 5s
100!

Skip Counting

Skip counting means we jump over some numbers. It is faster than counting one by one!

Count by 2s

Jump 2 numbers each time. Like hopping on two feet!

2 4 6 8 10 12 14 16 18 20

Count by 5s

Jump 5 numbers each time. Count your fingers!

5 10 15 20 25 30 35 40 45 50

Counting Backwards

We can also count backwards — from a big number down to a small number! Try it like a rocket launch countdown!

Counting back from 20:

20 → 19 18 17 16 15 14 13 12 11 10 Blast off!

Key Vocabulary

Count forwards

Saying numbers in order going up: 1, 2, 3, 4 ...

Count backwards

Saying numbers in order going down: 10, 9, 8, 7 ...

Skip counting

Jumping over some numbers, like counting by 2s or 5s.

Hundred

100 is one hundred. It is ten groups of ten!

Worked Examples

1

Fill in the missing number: 46, 47, __, 49, 50

Step 1: We are counting forwards, adding 1 each time.

Step 2: 47 + 1 = 48

Answer: The missing number is 48!

2

Count by 5s: 20, 25, __, 35, __

Step 1: We add 5 each time.

Step 2: 25 + 5 = 30, then 35 + 5 = 40

Answer: The missing numbers are 30 and 40!

3

Count backwards from 15 to 10

Step 1: Start at 15 and take away 1 each time.

Answer: 15, 14, 13, 12, 11, 10!

Knowledge Check

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Key Concepts Summary

Year 1: Counting to 20 Year 1: Number Recognition