Question

50 см + 40 см 40 дм - 30 дм 20 мм + 20 мм 80 мм - 20 мм 60 мм + 30 мм 70 см - 50 см​

Answer 1

50 см + 40 см = 90 см

40 дм - 30 дм = 10 дм

20 мм + 20 мм = 40 мм

80 мм - 20 мм = 60 мм

60 мм + 30 мм = 90 мм

70 см - 50 см = 20 см

Answer 2

To perform the given arithmetic operations, we need to convert all measurements to the same units. Let's convert everything to centimeters (cm):

1 decimeter (dm) = 10 cm 1 meter (m) = 100 cm 1 millimeter (mm) = 0.1 cm

Now, let's proceed with the calculations:

1. 50 cm + 40 cm = 90 cm
2. 40 dm = 40 * 10 cm = 400 cm 400 cm - 30 dm = 400 cm - 30 * 10 cm = 400 cm - 300 cm = 100 cm
3. 20 mm = 20 * 0.1 cm = 2 cm 2 cm + 20 mm = 2 cm + 2 cm = 4 cm
4. 80 mm = 80 * 0.1 cm = 8 cm 8 cm - 20 mm = 8 cm - 2 cm = 6 cm
5. 60 mm = 60 * 0.1 cm = 6 cm 6 cm + 30 mm = 6 cm + 3 cm = 9 cm
6. 70 cm = 70 * 1 cm = 70 cm 70 cm - 50 cm = 20 cm

So, the results of the given operations are:

1. 90 cm
2. 100 cm
3. 4 cm
4. 6 cm
5. 9 cm
6. 20 cm