Matikka

Matematiikka s. 26

Teht 1.
a) 25 + X = 40 b) 18 + X = 28 c) 27 + X = 45 d) 53 + X = 60
X = 15 X = 10 X = 8 X = 7

teht 2.

a) X + 15 = 30 b) X + 30 = 100 c) X + 44 = 86 d) X + 65 = 95
X = 15 X = 70 X = 42 X = 30

teht 3.

a) 30 - X = 12 b) 25 - X = 18 c) 55 - X = 22 d) 100 - X = 32
X = 18 X = 17 X = 33 X = 68

teht 4.

a) X - 18 = 22 b) X - 30 = 15 c) X - 55 = 45 d) X - 89 = 5
X = 40 X = 45 X = 100 X = 94

Matikka sivu 28.

teht 1.
a) 2 • X = 18 b) 4 • X = 32 c) 6 • X = 42 d) 3 • X = 36
X= 9 X=8 X=7 X=12

teht 2.
a) X • 10 = 110 b) X • 20 = 200 c) X • 15 = 45 d) X •40 = 800
X= 11 X= 10 X= 3 X= 20

teht 3.
a) 30 : X = 5 b) 28 : X = 4 c) 63 : X = 9 d) 100 : X = 5
X= 6 X= 7 X= 7 X= 20

teht 4.
a) x : 2 = 12 b) x : 5 = 9 c) X : 4 = 11 d) X : 3 = 12
X= 24 X= 45 X= 44 X= 36

teht 5.
a) 30 • X = 180 b) x • 50 = 1000 c) 64 : x = 4 d) x : 7 = 12
X= 6 X= 20 X= 16 X= 84

Teht 6.
a) 6 • X = 72 b) X • 15 = 60 c) X : 8 = 11 d) 100 : X = 25
X= 12 X= 4 X= 88 X= 4

teht 7.
a) 5 • x = 60 b) 7 • X = 84 c) 90 : X = 9 d) 100 : X = 20
X= 12 X= 12 X= 10 X= 5

teht 8.
a) X • 20 = 120 b) X • 30 = 150 c) 110 : X = 10 d) 200 : X = 50
X= 6 X= 5 X= 6 X= 4

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