Exercise 1. Choose the correct answer
a. The next number of 15478
A. 15477
B. 15479
C. 15749
D. 15747
b. Find the thousand round number between 8155 and 10548 is:
A. 9000 and 10000
B. 10000 and 11000
C. 9000 and 11000
D. 8000 and 9000
c. (84572 – 15478) : 2 is:
A. 34574
B. 34547
C. 76833
D. 76338
d. 12548 – 2354 : 3 is:
A. 3389
B. 2398
C. 3839
D. 3398
e. 4 km and 32 m equals ….. m
A. 432
B. 40032
C. 4032
D. 4,32
f. 2 hours and 10 minutes is ….. minutes.
A. 130 minutes
B. 30 minutes
C. 110 minutes
D. 34 minutes
Exercise 2. An irrigation team dug 132 m of ditch in 6 days. How many ditches
did that team dig in 7 days?
Exercise 3. Calculate:
a. 15874 – 9548
b. 56487 – 1272
c. 2145 x 6
d. 457 x 5 – 2154
e. 575 : 5
f. 10158 : 6
g. 1505 : 7 + 7 x 5
h. 2548 – 225 : 9
Exercise 4. Find x
a. x + 3557 = 25487
b. x : 9 = 268
c. 21658 – x = 3325
d. x + 254 = 648 – x
Exercise 5. The largest of the numbers 15745; 15475; 17256; 15487 is
A. 15745
B. 15475
C. 17256
D. 15487
Đáp án:
Exercise 1.
a. B
b. A
c. B
d. D
e. C
f. A
Exercise 2.
An irrigation team dug 132 m of ditch in 6 days. Therefore one day that team
dug:
132 : 6 = 32 (m)
That team dug in 7 days:
32 x 7 = 224 (m)
So that team dug 224 m in 7 days.
Exercise 3. Calculate:
a. 6326
b. 55215
c. 12870
d. 131
e. 115
f. 1693
g. 250
h. 2523
Exercise 4. Find x
a. x + 3557 = 25487
→ x = 25487 – 3557 = 21930
b. x : 9 = 268
→ x = 268 x 9 = 2412
c. 21658 – x = 3325
→ 21658 – 3325 = x
→ x = 18333
d. x + 254 = 648 – x
→ x + x = 648 – 254
→ 2x = 394
→ x = 394 : 2 = 197
Exercise 5. C