1. Which is the smallest natural number?

2. Which is the smallest whole number?

3. Carry out the additions 273 + 56 + 44 in the easier way, using the known properties.

4. Carry out the additions 5107 + 2950 + 343 in the easier way, using the known properties.

5. Carry out the multiplications 48 x 5 x 2 in the easier way, using the properties.

6. Carry out the multiplications 16 x 25 x 408 in the easier way, using the properties.

7. Rewrite 9 (3 + 14) in the form of a x b + a x c.

8. Rewrite 20 (58 + 109) in the form of a x b + a x c.

9. Rewrite 15 x 3 + 15 x 7 in the form of a (b + c).

10. Rewrite 9 x 38 + 9 x 12 in the form of a (b + c).