WorksheetsMENTAL MATH
Total questions: 73
Worksheet time: 48mins
20+21=
42
43
41
40
16+13=
21
29
23
26
50+50=
100
102
120
110
49+21=
73
78
70
77
16+12=
28
25
24
22
80+20=
102
100
101
115
70+10=
80
81
84
86
70+60=
132
133
130
131
20+31
54
52
51
55
22+28=
50
55
52
51
45+42=
89
80
88
87
56+54
110
112
113
116
32+33=
67
66
69
65
60+67=
127
128
126
125
66+63=
128
129
126
125
5 + __=7
2
4
5
7
2 + __=9
2
9
7
8
3 + __=10
3
7
10
6
4 + __=11
11
8
4
7
6 + __=13
7
6
5
13
6 + __= 10
4
6
3
10
7 + __=8
4
1
7
8
8 + __=12
12
8
4
5
9 + __=9
0
9
8
1
10 + __=14
10
4
14
5
1 + __=5
5
1
3
4
3 + __=10
7
3
10
4
4 + __=9
3
9
4
5
5 + __=5
2
5
1
0
6 + __=8
3
6
2
8
15
+ 2
17
18
67
+ 3
70
10
22
+12
44
34
71
+36
107
17
68
+33
101
100
75
+48
123
122
93
+ 4
96
97
26
+ 2
27
28
75
+ 6
81
91
79
+ 4
83
82
Round 57 to the nearest ten
50
55
60
67
Round 82 to the nearest ten.
80
85
90
92
Do you need to regroup to subtract 72-47?
Yes
No
Do you need to regroup 88-25?
Yes
No
When using our mental math strategy…
Pick the number to round in
43-27
43
27
When using our mental math strategy…
Pick the number to round.
73-56=
73
56
To make 57 a ten add
(a)
To make 48 a ten add
(a)
When subtracting
63-39 you should first add
63+1
39+1
39+10
63+7
When subtracting
71-58 you should first add
71+58
71+9
58+2
Don’t add
When subtracting
84-49
You should add 1 to 49.
Subtract 84-50=34.
Then you should
Subtract 1 from 34
Add 1 to 34
Round 34 to 30
When subtracting
90-48
Add 2 to 48, 48+2=50
Then subtract 90-50=40.
Last you should
Add 2 to 40
Subtract 2 from 40
Add 10 to 40
Subtract 10 from 40
3 x 9 =
18
27
21
54
8 x 4 =
12
24
32
40
7 x 6 =
56
35
49
42
2 x 9 =
81
36
14
18
5 x 4 =
20
25
10
12
6 x 8 =
40
48
45
84
5x0=
5
0
50
10
10x2=
2
0
10
20
5x5
5
20
25
30
9x0=
9
1
10
0
3x1=
3
2
1
0
10x10=
0
10
100
1000
2x3
2
3
5
6
5x2=
2
5
7
10
3x10
30
10
13
0
7x1=
0
7
1
8
2x6=
8
10
12
14
4x10=
4
14
0
40
10x0=
10
0
100
1
3x3=
3
6
9
12
5x6=
5
25
11
30
