22 MPAH 2A 01 Teaching Aid Slides_Numbers to 1000

1.

Primary 2 Mathematics
Numbers to 1000
My Pals Are Here, Book A, Chapter 1: Numbers to 1000
Shaping Maths, Book A, Unit 1: Numbers to 1000
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© 2016 Marshall Cavendish Education Pte Ltd

2.

Chapter Learning Outcomes
Identifying numbers up to 1000 through:
• counting in 1s, 10s and 100s
• reading and writing numbers in
numbers and words
• number notation to place value
• comparing numbers
• number order and patterns
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© 2016 Marshall Cavendish Education Pte Ltd

3.

Counting in 1s, 10s and 100s
Counting in ones is the
adding of 1.
Counting in tens is the
adding of 10.
+1
+1
+1
+1
+1
45, 46, 47, 48, 49, 50
+10 +10 +10 +10 +10
50, 60, 70, 80, 90, 100
Counting in hundreds is the +100 +100 +100 +100 +100
120, 220, 320, 420, 520, 620
adding of 100.
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© 2016 Marshall Cavendish Education Pte Ltd

4.

Let’s Try!
Count in ones.
+1
78
+1
79
+1
+1
80
82
81
Count in tens.
+10
42
+10
52
+10
62
+10
72
82
Count in hundreds.
+100
125
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© 2016 Marshall Cavendish Education Pte Ltd
+100
225
+100
325
+100
425
525

5.

Reading and Writing Numbers
Numbers can be presented in numbers
or words.
Numbers
Words
128
250
477
One hundred and twenty-eight
Two hundred and fifty
Four hundred and seventy-seven
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© 2016 Marshall Cavendish Education Pte Ltd

6.

Let’s Try!
Fill in the missing answers.
Numbers
Words
642
Six hundred and forty-two
753
Seven hundred and fifty-three
919
Nine hundred and nineteen
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© 2016 Marshall Cavendish Education Pte Ltd

7.

Number Notation to Place Value
Each digit in a number carries a certain value.
593 = 5 hundreds, 9 tens, 3 ones
ones place
‘3’ stands for 3 ones or 3
tens place
‘9’ stands for 9 tens or 90
hundreds place
‘5’ stands for 5 hundreds or 500
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© 2016 Marshall Cavendish Education Pte Ltd

8.

Let’s Try!
Fill in the blanks.
265 = 2 hundreds, 6 tens, 5 ones
ones
place
5 stands for
tens
5 ones
or
5
or
60
place
6 stands for
6 tens
hundreds place
2 stands for
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© 2016 Marshall Cavendish Education Pte Ltd
2 hundreds or
200

9.

Comparing Numbers
Numbers are compared using the terms
‘greater than’ and ‘smaller than’.
Step 1: Compare the hundreds of the first number
and the second number.
• When comparing 358 and 279, three hundreds is
greater than two hundreds.
So, 358 is greater than 279.
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© 2016 Marshall Cavendish Education Pte Ltd

10.

Comparing Numbers
Step 2: Compare the tens of the first number
and the second number.
When comparing 339 and 359, three tens is
smaller than five tens.
So, 339 is smaller than 358.
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© 2016 Marshall Cavendish Education Pte Ltd

11.

Comparing Numbers
Step 3: Compare the ones of the first number
and the second number.
When comparing 358 and 352, eight ones is
greater than two ones.
So, 358 is greater than 352.
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© 2016 Marshall Cavendish Education Pte Ltd

12.

Let’s Try!
Compare each pair of numbers.
Circle the greater number.
a) 161
196
b) 553
453
c) 981
980
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© 2016 Marshall Cavendish Education Pte Ltd

13.

Number Order and Patterns
Numbers form a pattern when they are arranged in a
systematic order.
Adding or subtracting a fixed number can give us the
next number.
365, 370, 375, 380, 385, ?
365, 370, 375, 380, 385, 390
+5
125, ? , 325, 425, 525, 625
+5
+5
+5
+5
125, 225, 325, 425, 525, 625
+100 +100 +100 +100 +100
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© 2016 Marshall Cavendish Education Pte Ltd

14.

Let’s Try!
Fill in the missing number.
846, 876, ? , 936, 966, 996
846, 876, 906, 936, 966, 996
+30 +30
550, 500, 450, 400, 350, ?
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+30
550, 500, 450, 400,350, 300
–50
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+30 +30
–50 –50 –50
–50

15.

Odd and Even Numbers
For any number, the digit in the ones place
tells us whether the number is odd or even.
If the digit in the ones place is 1, 3, 5, 7 or 9,
the number is odd.
If the digit in the ones place is 0, 2, 4, 6 or 8,
the number is even.
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© 2016 Marshall Cavendish Education Pte Ltd

16.

Odd and Even Numbers
Here are some examples of odd and
even numbers.
Odd numbers
7
61
243
545
967
999
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© 2016 Marshall Cavendish Education Pte Ltd
Even numbers
2
54
106
388
500
994

17.

Let’s Try!
Can you tell if each of these numbers is odd
or even?
531
822
27
odd
even
odd
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© 2016 Marshall Cavendish Education Pte Ltd

18.

Reference — Textbooks
Learning Outcomes
Identifying numbers up to 2A
pp. 3 – 25
1000 through:
• counting in 1s, 10s and
100s
• reading and writing
numbers in numbers
and words
• number notation to
place value
© 2016 Marshall Cavendish Education Pte Ltd
© 2016 Marshall Cavendish Education Pte Ltd
2A
pp. 4 – 24

19.

Reference — Textbooks
Learning Outcomes
Identifying numbers up to
1000 through:
• comparing numbers
• number order and
patterns
© 2016 Marshall Cavendish Education Pte Ltd
© 2016 Marshall Cavendish Education Pte Ltd
2A
pp. 3 – 25
2A
pp. 4 – 24