2. Paiguta tühjadesse ruutudesse paarisarvud 2, 6, 8, 12, 14, 16, 18 nii, et summa igas reas, tulbas ja diagonaalis oleks 30!
4. Arvuta peast!
80 + (90 - 6 · 7) = ..........
750 - (80 + 5 · 6) = ..........
66 - 4 · 8 + 25 = ..........
250 - (70 + 5 · 8) = ..........
5. Leia tähe arvväärtus!
| 6 548 - a = 2 981 a = ......................... a = .......... |
 |
| b - 3 486 = 52 972 b = ......................... b = .......... |
 |
6. Leia tähe d arvväärtus! Tehted tee vihikus.
a + b = 856 449
c - d = 312 002
a = 413 607
b = c
8 kg 460 g + 13 kg 520 g
12 kg 880 g + 19 kg 305 g
65 km 100m - 38 km 50 m
42 km 198 m - 20 km 300 m6 t 345 kg + 18 t 702 kg
2 t 800 kg - 982 kg + 15 t
15 km 356 m - 8 km 112 m - 2 km
8 km 305 m - 6 km 40 m + 338 m470 - (90 - 6 · 5) = ..........
90 - (34 + 26) = ..........
70 - 17 + 30 = ..........
4 · 9 + 3 · 8 = ..........
