WorksheetsCộng trừ số tròn chục
Total questions: 100
Worksheet time: 2hrs 40mins
70
20
-60
10
(a)
70
-20
-50
20
(a)
30
50
-60
-10
(a)
50
30
-20
10
(a)
50
-50
40
-40
(a)
90
-50
50
-50
(a)
90
-70
-10
20
(a)
10
-10
20
20
(a)
40
50
-70
-20
(a)
90
-40
10
10
(a)
30
50
-10
20
(a)
10
70
-50
-30
(a)
90
-50
50
-40
(a)
70
20
-30
-10
(a)
20
10
60
-20
(a)
90
-10
-70
60
(a)
10
-10
10
10
(a)
10
50
-50
-10
(a)
10
80
-80
-10
(a)
60
-50
-10
90
(a)
30
-10
-20
50
(a)
80
-50
50
-30
(a)
30
50
-20
-10
(a)
20
-20
30
10
(a)
50
10
10
-60
(a)
50
30
-10
-20
(a)
90
-30
-10
-50
(a)
70
-60
-10
10
(a)
50
-50
40
50
(a)
70
10
-60
70
(a)
20
-20
40
50
(a)
70
20
-60
-30
(a)
50
40
-10
-30
(a)
70
-50
-10
-10
(a)
20
70
-80
70
(a)
10
70
-70
80
(a)
30
50
-50
-10
(a)
30
-10
-20
80
(a)
60
-50
-10
70
(a)
30
-10
20
50
(a)
70
10
-50
-10
(a)
60
10
-10
30
(a)
70
10
-70
-10
(a)
20
-10
-10
30
(a)
10
60
20
-30
(a)
10
10
70
-20
(a)
20
60
-20
-50
(a)
90
-50
-10
-30
(a)
70
10
-70
-10
(a)
30
-30
40
50
(a)
10
-10
50
40
(a)
80
-50
-30
70
(a)
30
-30
30
-30
(a)
60
-50
70
-50
(a)
70
10
-30
40
(a)
40
50
-10
-60
(a)
20
-10
30
-20
(a)
50
40
-30
-10
(a)
10
30
-20
-20
(a)
80
-20
20
-30
(a)
90
-30
20
-10
(a)
60
-10
30
-30
(a)
50
10
20
-50
(a)
40
-20
10
10
(a)
50
-50
30
60
(a)
80
-50
-30
50
(a)
40
-40
20
20
(a)
60
20
-60
-20
(a)
30
10
50
-50
(a)
10
80
-80
10
(a)
60
-50
-10
70
(a)
90
-50
50
-70
(a)
60
-10
10
30
(a)
90
-30
-10
-50
(a)
40
-40
90
-80
(a)
50
-50
70
-50
(a)
60
-50
-10
80
(a)
30
50
-50
-20
(a)
70
10
-70
-10
(a)
90
-40
-50
80
(a)
50
-50
10
-10
(a)
20
70
-80
-10
(a)
40
-10
50
-30
(a)
90
-10
-20
-10
(a)
30
-30
60
-50
(a)
80
-30
30
-60
(a)
30
60
-70
-10
(a)
40
50
-60
50
(a)
60
30
-50
50
(a)
60
-50
-10
60
(a)
40
-20
-20
10
(a)
50
-50
60
30
(a)
50
-50
70
-60
(a)
20
10
10
50
(a)
10
30
50
-20
(a)
50
-50
40
-40
(a)
90
-50
-10
-20
(a)
10
-10
10
-10
(a)
80
-20
-50
-10
(a)
40
-40
90
-60
(a)
