1
Mathematics 2
24 – November 2013
Classwork # 10
Exercise 1.
Easy
Difficult
Interesting
Boring
A. Draw graphic model and express in the shown units:
1 m 2 dm =
dm = _______________
4 m 3 dm =
dm = _______________
- unit (cm)
=
- ten (dm)
=
- hundred
(m)
35 dm =
m
dm
= _____________________________
15 dm =
m
dm
= _____________________________
B. The length of a piece of fabric is 16 m. How long was it before the tailor cut out 5
meters?
A birch tree is 12 m tall. A Sorbus tree is 8 m tall. Which tree is taller and by how much?
In order to cut a dress a tailor has used 5 m of wool. To cut a suit the tailor has used 3
more meters of wool than to cut the dress. How many meters of wool has he used to cut
both the dress and the suit?
C. Fill out the table:
2 m = 20 dm = 200 cm
6m=
dm =
cm
3m=
dm =
cm
7m=
dm =
cm
4m=
dm =
cm
8m=
dm =
cm
5m=
dm =
cm
9m=
dm =
cm
2
D. Compare:
<>=
☐ 700
300 ☐ 500
☐ 400
900 ☐ 9
800
40
3 m ☐ 3 cm
☐ 100
500 ☐ 99
62
500 cm ☐ 50 dm
4 dm ☐ 40 cm
9 m ☐ 900 cm
60 dm ☐ 6 m
80 cm ☐ 80 m
E.
What is the mass of the bag?
2
5
One of the bottles is full and one
is empty. Find the empty one.
5
1
F. Perform the actions:
8 m 6 dm – 4 m 2 dm =
2 m 1 dm + 6 m =
8 m 9 dm – 3 m 5 dm =
7 m 5 dm – 3 dm =
5 m 6 dm + 2 m 4 dm =
9 m 8 dm – 4 m 7 dm =
7 m – 3 m 8 dm =
3 m 5 dm + 1 m 9 dm =
G. Sasha has measured the length and the width
of his room. It turned out that the room is 3 m 4
dm 6 cm long and 2 m 3 dm 1 cm wide. How
much is the room longer than wider?
3
H. Mathematical puzzles:
Igor has made up a number. When he added 400 to this
number he obtained 900. Which number did Igor make up?
Sophie made up a number and subtracted 600 from it. As a
result she got 200. What number did Sophie make up?
Boris made up a number, subtracted it from 700 and
obtained 300. Which number did he make up?
I. Anna and Lena labeled the point A on a numeric line and wrote 3 consecutive numbers
each. Anna wrote: A + 1, A + 2, and A + 4. Lena wrote A – 1, A, and A + 1. Which of
them is right?
Exercise 2.
Easy
Difficult
Complete the statements to make them correct:
A watch measures ___________________
Every car has a(n) ___________________
Some kids like ______________________
Watch does not measure ______________
Some kids dislike ___________________
All parrots _________________________
Some parrots _______________________
Interesting
Boring
4
Exercise 3.
Easy
Difficult
Interesting
Boring
Cross out the shape that does not belong to the group
Exercise 4.
Easy
Difficult
Interesting
Boring
A. Compare:
A+ K ☐A– K
A + B ☐ A + C, if B is bigger than C
T+P☐T–P
A + B ☐ A + C, if B is smaller than C
B. Solve:
F + F = 10
8–P=P
T+T=T
C. Compare one-/two-digit numbers:
SP ☐ M
Q0 ☐ Q1
KL ☐ LK
D. Knowing that T = K + M + C compare:
T☐K
M+C☐T+K
T–C☐K+M
C+M+K☐T
E. Solve the examples with one-digit and two-digit numbers:
8C
- 4C
8C – 4C =
2B + 10 =
A+A+A= 3