Show:
Missing ADDEND
Problems
Speed Addition
Missing ADDENDS Problems
Mystery
100

12 + x = 24

12

100
8+9=
17
100
10+12+x=32
10
100
8x2=
16
200

6+ x = 26

20

200
12+10=
22
200
8+9+x=20
3
200
5+6+8=?
20
300
8+x=20
12
300
22+11=
33
300
33+24+x=144
87
300
8+x=34
26
400
20 + x=44
24
400
55+60=
115
400
37+x+93=202
72
400
9x9=
81
500
107 + x= 236
129
500
234+14
248
500
X+55+78=189
56
500
578+x=736
147