Grade 1 · Set C · Side 1 of 2
The missing part
C
Start Finish
Goal: 10 min for both sides
Score/ 48
Remember: A whole is two parts. Find the part that is missing.
16 = − 7
212 = 9 +
35 = 7 −
43 = − 9
513 − 7 =
6 − 7 = 6
77 = − 1
89 = − 3
910 = + 8
101 = − 2
119 = − 7
1210 − = 5
13 = 16 − 7
143 = − 4
15 + 5 = 8
16 = 6 − 2
17 = 10 − 4
182 + = 10
19 + 3 = 9
2013 = 6 +
219 = 12 −
221 = 10 −
23 = 2 + 2
2416 = 9 +
Grade 1 · Set C · Side 2 of 2
The missing part
C
Start Finish
Goal: 10 min for both sides
Score/ 48
255 = − 7
269 = 14 −
27 + 3 = 8
282 = − 6
2912 = + 4
306 = 7 −
319 + = 11
327 = + 5
336 = − 4
34 + 3 = 10
35 = 6 + 9
36 + 8 = 11
3713 − = 5
3816 = + 9
395 = − 8
405 − 3 =
41 = 16 − 8
42 + 4 = 12
437 = − 3
442 − 1 =
45 − 2 = 8
4615 = 9 +
4714 = 8 +
4812 − = 3
Answer key · Grade 1 · Set C
The missing part
113
23
32
412
56
613
78
812
92
103
1116
125
139
147
153
164
176
188
196
207
213
229
234
247
2512
265
275
288
298
301
312
322
3310
347
3515
363
378
387
3913
402
418
428
4310
441
4510
466
476
489
Mark each answer, count the right ones and write the score on the sheet. Beat your own time next time.