Page 185 - NUMINO TB_3A
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3˙—‡ -A˙ · 2–‡ 2011.3.22 9:31 PM ˘ ` 174 PDF_In 2540DPI 100LPI T
Challenge P. 78~79 Multiplying by 8 Multiplying by 9
1 . a . 2 isosceles triangles-2 yellow 1 blue, 2 blue 0 0
91 91
1 yellow
2 equilateral triangles-3 yellow, 3 blue 82 82
b . An isosceles triangle with 2 orange and 7 37 3
1 blue Anglegs cannot be made because the 64 64
2 orange sides will not meet the two ends of 5 5
the blue line. When multiplying by 3, 7, and 9, it is possible for
Also, an isosceles triangle with 2 orange and
1 yellow Anglegs cannot be made because every number to be in the ones place. When
the sum of the lengths of 2 orange sides is
multiplying by 2, 4, 6, and 8, it is only possible for
the same as the length of the yellow Angleg. 0, 2, 4, 6, and 8 to be in the ones place. When
multiplying by 8 or 9, the lines do not cross
c . In order to make a triangle, the length of any
because the ones place digits come out in order
2 sides put together must exceed the length
of the longest side. from greatest to least and do not skip back and
forth.
Activity 1 P. 82~83
Unit 09. Multiplication Tables 1 . 1 2 3 4 5 6 7 8 9 10
Multiplying by 3 P. 80~81 2 4 6 8 10 12 14 16 18 20
Multiplying by 4 3 6 9 12 15 18 21 24 27 30
0 4 8 12 16 20 24 28 32 36 40
91 0 5 10 15 20 25 30 35 40 45 50
91 6 12 18 24 30 36 42 48 54 60
82 7 14 21 28 35 42 49 56 63 70
82 8 16 24 32 40 48 56 64 72 80
9 18 27 36 45 54 63 72 81 90
73 73 10 20 30 40 50 60 70 80 90 100
64 64 All the numbers in the rows and columns
5 5
skip-count by the numbers that they start
Multiplying by 6 Multiplying by 7
with. The numbers in diagonals skip-count in
0 0
91 91 various patterns.
(Ex: Diagonal from 1 to 100, 1 3 = 4,
82 82 4 5 = 9, 9 7 = 16, ...).
73 73 2 . 2, 4, 6, 8, 10, 12, 14, 16, 18
64 64 3, 6, 9, 12, 15, 18, 21, 24, 27
5 5 4, 8, 12, 16, 20, 24, 28, 32, 36
5, 10, 15, 20, 25, 30, 35, 40, 45
6, 12, 18, 24, 30, 36, 42, 48, 54
7, 14, 21, 28, 35, 42, 49, 56, 63
8, 16, 24, 32, 40, 48, 56, 64, 72
9, 18, 27, 36, 45, 54, 63, 72, 81
174
Challenge P. 78~79 Multiplying by 8 Multiplying by 9
1 . a . 2 isosceles triangles-2 yellow 1 blue, 2 blue 0 0
91 91
1 yellow
2 equilateral triangles-3 yellow, 3 blue 82 82
b . An isosceles triangle with 2 orange and 7 37 3
1 blue Anglegs cannot be made because the 64 64
2 orange sides will not meet the two ends of 5 5
the blue line. When multiplying by 3, 7, and 9, it is possible for
Also, an isosceles triangle with 2 orange and
1 yellow Anglegs cannot be made because every number to be in the ones place. When
the sum of the lengths of 2 orange sides is
multiplying by 2, 4, 6, and 8, it is only possible for
the same as the length of the yellow Angleg. 0, 2, 4, 6, and 8 to be in the ones place. When
multiplying by 8 or 9, the lines do not cross
c . In order to make a triangle, the length of any
because the ones place digits come out in order
2 sides put together must exceed the length
of the longest side. from greatest to least and do not skip back and
forth.
Activity 1 P. 82~83
Unit 09. Multiplication Tables 1 . 1 2 3 4 5 6 7 8 9 10
Multiplying by 3 P. 80~81 2 4 6 8 10 12 14 16 18 20
Multiplying by 4 3 6 9 12 15 18 21 24 27 30
0 4 8 12 16 20 24 28 32 36 40
91 0 5 10 15 20 25 30 35 40 45 50
91 6 12 18 24 30 36 42 48 54 60
82 7 14 21 28 35 42 49 56 63 70
82 8 16 24 32 40 48 56 64 72 80
9 18 27 36 45 54 63 72 81 90
73 73 10 20 30 40 50 60 70 80 90 100
64 64 All the numbers in the rows and columns
5 5
skip-count by the numbers that they start
Multiplying by 6 Multiplying by 7
with. The numbers in diagonals skip-count in
0 0
91 91 various patterns.
(Ex: Diagonal from 1 to 100, 1 3 = 4,
82 82 4 5 = 9, 9 7 = 16, ...).
73 73 2 . 2, 4, 6, 8, 10, 12, 14, 16, 18
64 64 3, 6, 9, 12, 15, 18, 21, 24, 27
5 5 4, 8, 12, 16, 20, 24, 28, 32, 36
5, 10, 15, 20, 25, 30, 35, 40, 45
6, 12, 18, 24, 30, 36, 42, 48, 54
7, 14, 21, 28, 35, 42, 49, 56, 63
8, 16, 24, 32, 40, 48, 56, 64, 72
9, 18, 27, 36, 45, 54, 63, 72, 81
174
