Transcript Document

Mohamed Korayem Language
School
Mathematics section
maths revision
• Prepared by
• Mrs. . Mervat Naeem
Place Value
Call out the number before the
answer appears.
When you see it ,
say it!
First look at the tens digit.
Two tens are
twenty!
Next look at the units digit.
Five units are 5.
Two tens and Five units = 25
Now it’s your turn, but
remember:
When you see it, SAY IT!
twenty-six
26
sixteen
16
Thirty- Five
35
Well Done!
You have worked hard reading twodigit numbers
Can you match the 2 digit numbers
to the correct words?
ninety nine
fifty five
twelve
Can you match the 2 digit numbers
to the correct words?
thirteen
twenty seven
thirty one
Can you match the 2 digit numbers
to the correct words?
forty one
twenty nine
sixty three
Now let’s have fun
Can you add
with
Mr Big?
Mr Big always
puts the big
number in his
head first and
then counts on!
Like this……
2+7=9
7
7+ 2 = 9
Good
Job!
Now help
Mr Big
work out
this
number
sentence.
1 + 9 = 10
9
Good
Job!
Now try these:
3+6=
4+6=
7+2=
5+7=
3 + 10 =
Well done, Year 1.
Now remember addition
can be done in any
order, but Mr Big’s idea
is a useful one to
remember too!
Adding in our heads
We are learning to add two 2-digit numbers together in our
heads.
Adding on a multiple of ten
Let’s count in ten’s starting
from the number 3
When we count on in tens,
our finger jumps down the
hundred square.
We’re going to solve this
sum …
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
33 +10 =
Find number 33 on the hundred square
then jump down once.
What number do you land on?
43
Let’s solve some more
sums.
53 +20=
Find the number 53 on the
hundred square. This time
we are adding 20, that’s
two jumps of ten, so we
need to jump down twice.
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
What number do we land on?
73
1) 23 + 10 = 33
11) 29 + 50 = 79
2) 37 + 20 = 57
12) 61+ 20 =81
3) 25 + 40 = 65
13) 22 + 40 = 62
4) 31 + 10 = 41
14) 74 + 10 = 84
5) 45 + 40 = 85
15) 43 + 40 = 83
6) 24 + 30 = 54
16) 56 + 20 = 76
7) 42 + 20 = 62
17) 49 + 30 = 79
8) 57 + 40 = 97
18) 17+ 50 = 67
9) 76 + 10 = 86
19) 22 + 40 = 62
10) 38 + 40 =78
20) 13 + 60 = 73
Now we are ready for the tricky ones!
24 + 10
5=
39
•We are going to start with the number 24.
•We need to split up (partition) the number 15
to make it easier to solve.
•Now 24 + 10 = 34
And 34 + 5 = 39
•This means the answer to 24 + 15 = 39
31 + 10
6=
47
•We are going to start with the number 31.
•We need to split up (partition) the number 16
to make it easier to solve.
•Now 31 + 10 = 41
And 41 + 6 = 47
•This means the answer to 31 + 16 = 47
Now you are ready to try
some on your own …
adding 2 digit numbers using partitioning.
Remember
tens and units!
What strategies would you use to add
2 two-digit numbers quickly?
• This is one way to do it.
• Split the units.
• Split the tens.
• Count on.
Start with the units .
72 +15 = 87
• 7 0 + 10 = 80
• 60 + 23 = 83
• 50 + 5 = 55
43 +56 =
• Split the units .
• Start with the units .
• 40 + 50 = 90
• 90 + 3 = 93
• 93 + 6 = 99
99
Split the tens.
Can you guess the
shape?
I am a flat shape.
I have 1 curved side.
I have no corners.
What shape am I?
I’m a
circle!
I am a flat shape.
I have 3 straight sides.
I have 3 corners.
What shape am I?
I’m a
triangle!
I am a flat shape.
I have 4 straight sides.
I have 4 corners.
All my sides are the same length.
What shape am I?
I’m a
square!
I am a flat shape.
I have 4 straight sides.
I have 4 corners.
I have two short sides and two long sides.
What shape am I?
I’m a rectangle !
WELL DONE
What shape am I?
• I have no flat faces.
• I have no straight edges.
• I have just one curved face.
I am a …………?
Well Done!
I am a sphere!
What shape am I?
• I have one curved face.
• I have one flat face.
• My flat face is a circle.
I am a …………?
Great work!
I am a cone!
What shape am I?
• I have 6 flat square faces
• I have 12 straight edges
• I have 8 corners.
I am a …………?
Fantastic!
I am a cube!
What shape am I?
• I have one curved face
• I have 2 flat circular faces.
I am a …………?
Well Done!
I am a
cylinder
What shape am I?
• I have 6 flat faces
• My faces are all rectangles.
• I have 12 straight edges and 8
corners.
I am a …………?
Brilliant!
I am a cuboid!