Το καλάθι σου είναι άδειο.
Practice
{{exercise_number}}. Do the calculations. Check the results.
a) Check: b) Check:
180\latex{ \div }20=
30\latex{ \times }4=
60\latex{ \times }3=
9\latex{ \times }70=
5\latex{ \times }80=
360\latex{ \div }6=
200\latex{ \div }5=
250\latex{ \div }50=
{{exercise_number}}. Write the missing factors in the squares marked.
·
240=
500=5·
=25·
=50·
·60=3·
·
=
=
·
·
=
=
=120·
{{exercise_number}}. Fill in the tables.
5
840
50
9
2
4
\latex{ \times }
20
70
30
60
240
480
720
\latex{ \div }
10
2
40
{{exercise_number}}.
1
Sue and her friends are playing with coloured chips. At he
end of the game they calculate the value of their chips.
a) Continue filling in the table.
chip
4
100
50
20
10
points
Total points:
Edith
Benny
Mark
Alex
Sue
9
3
5
1
2
0
4
6
3
0
8
0
2
4
5
4
3
0
3
2
5
10
0
7
2\latex{ \times }100+3\latex{ \times }50+8\latex{ \times }10+7\latex{ \times }1=437
b) Complete the sentences to make the statements true.
chips.
Edith and Alex together have
Sue has
more points than Alex. Edith has
fewer points than Mark.
points than Mark.
\latex{ \textcolor{#0089d7}{\bullet} }
\latex{ \textcolor{#0089d7}{\bullet} }
\latex{ \textcolor{#0089d7}{\bullet} }
Benny would have the most points if he had twice as many
{{exercise_number}}. Which number did I think of? Write it down with operation. Calculate.
\latex{ \textcolor{#0089d7}{\bullet} } The quotient is 8, the divider is 40:v
\latex{ \textcolor{#0089d7}{\bullet} } The dividend is 680, the divider is 20:
\latex{ \textcolor{#0089d7}{\bullet} } The multiplier is 9, the multiplicand is 30:
\latex{ \textcolor{#0089d7}{\bullet} } The product is 930, the multiplier is 3:
{{exercise_number}}. Calculate the products. Estimate first with values rounded to the nearest ten, and check afterwards with addition on paper.
Est.:
Check.:
Est.:
Est.:
Est.:
Est.:
197·5
+143
216·3
241·4
356·2
143·2
143
{{exercise_number}}. Based on estimates, arrange the products in decreasing order by numbering them. Calculate and check if the order is correct.
132\latex{ \times }6
237\latex{ \times }3
415\latex{ \times }2
163\latex{ \times }5
349\latex{ \times }2
248\latex{ \times }3
{{exercise_number}}. Which numbers satisfy the calculations?
381 \latex{ \times }2<
:
>274\latex{ \times }2
381 \latex{ \times }2<
274 \latex{ \times }3>
143\latex{ \times }6<
:
:
...
, , ,
, , , ,
, , , ,
...
...
{{exercise_number}}. 108 pairs appeared in the national folk dance festival.
b) The dancers appearing in the festival received 3 tickets each.
How many tickets in total were handed out?
a) How many dancers took part in the festival?
{{exercise_number}}. Which digits do the letters represent in the calculations? Assemble the letters in the order of their increasing values to get a word.
920
0·2
860
172·
41
·2
3
5·3
7·4
834
975
548
U I
N
A
E
P T
I=
Solution:
N=
A=
E=
P=
T=
U=
{{exercise_number}}. Do the calculations.
1000
234
+137
·3
·2
-576
-279
+
{{exercise_number}}.
b) The price of one rose is €9 including the decoration.
The decoration costs €4 . How much do 5 roses cost
without decoration?
a) Judy bought a book and a flower. The flower cost €5, the book cost
twice as much. How much did Judy pay for both?
{{exercise_number}}. Do the calculations. Pay attention to the order of operations.
413\latex{ \times }2\latex{ -}258\latex{ \times }3=
239+7\latex{ \times }89=
239+7\latex{ \times }89=
2\latex{ \times }(517\latex{ - }316)=
467\latex{ - }126\latex{ \times }2=
467\latex{ - }126\latex{ \times }2=
143\latex{ \times }3+57\latex{ \times }6=
(176+97)\latex{ \times }2=
(176+97)\latex{ \times }2=
c)
a)
b)
{{exercise_number}}. Which number did I think of? Write it down with operation. Do the calculation.
a) The diffrence between 3 times 276 and 479.
b) 219 greater than 4 times 165.
b) 219 greater than 4 times 165.
{{exercise_number}}. The arrow always points to three times the number. Draw in the missing arrows.
c)
a)
b)
54
18
6
3\latex{ \times }9
2\latex{ \times }6
486
2
243\latex{ \times }4
162
1\latex{ \times }4
9\latex{ \times }27
162\latex{ \times }2
9\latex{ \times }4
5\latex{ \times }2\latex{ - }1
243\latex{ \times }3
3\latex{ \times }1
54\latex{ \times }2
9\latex{ \times }9
{{exercise_number}}. The stride of Don’s toy robot can be set between 1 cm and 18 cm.
How long strides must be set for the robot to complete the following distances with whole strides?
(Find several solutions.)
(Find several solutions.)
5 cm;
a)
b)
c)
d)
24 cm
20 cm;
12 cm;
{{exercise_number}}.
b) Write the following numbers in the
correct sections of the Venn diagram.
multiple of
a) Complete the statements in the Venn diagram.
divisible by
77
140
56
12
100
7
8
42
16
70
49
2
21
35
0
14
28
10
6
4
{{exercise_number}}. Connect the definitions with the corresponding shapes. Each shape is one whole.
1 sixth
1 fourth
1 half
1 third
{{exercise_number}}. Colour in one fourth of each drawing. Each rectangle is one whole.
{{exercise_number}}. Mark the fractions with colours in three different ways. Each rectangle is one whole.
a) 1 third; b) 1 fifth
{{exercise_number}}. 360 rolls were baked this morning in the bakery. More than a third of them have been sold before midday. How many can have been sold? How many remained for the afternoon?
remained
sold
{{exercise_number}}. Andy added up two numbers, and the sum was 960. One of the numbers was twice greater than the other. Which two numbers did Tom add up?
{{exercise_number}}. Write the correct relational signs in the squares.
+5
\latex{ - }5
0
b)
\latex{ - }5
a)
0
\latex{ - }2
+6
+2
0
+3
\latex{ - }1
\latex{ - }4
\latex{ - }5
\latex{ - }3
+4
\latex{ - }3
\latex{ - }7
\latex{ - }7
+5
\latex{ - }1
\latex{ - }6
\latex{ - }4
+1
The number line will help.
{{exercise_number}}. Write the missing values in the blank spaces. Red means warming, blue means cooling.
1°C
6°C
°C
2°C
0°C
°C
\latex{ - }2°C
4°C
°C
°C
°C
°C
5°C
7°C
5°C
6°C
3°C
7°C