Capacity Basic 3 Mathematics Lesson Note

A. COUNTING SKILL: NUMBERS 941-960

Counting from 941 to 960: 941, 942, 943, 944, 945, 946, 947, 948, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960

Practice counting:

• From 945 to 955: _______
• From 952 to 960: _______
• Backwards from 960 to 950: _______

Fill in missing numbers:

• 946, 947, _____, 949, _____
• 955, _____, 957, _____, 959
• _____, 942, _____, 944, _____

B. WRITING SKILL: WRITING THE NUMBERS

Write in words:

• 941 = Nine hundred and forty-one
• 945 = Nine hundred and forty-five
• 950 = Nine hundred and fifty
• 955 = Nine hundred and fifty-five
• 960 = Nine hundred and sixty

Write in figures:

• Nine hundred and forty-three = _______
• Nine hundred and forty-eight = _______
• Nine hundred and fifty-two = _______
• Nine hundred and fifty-seven = _______
• Nine hundred and fifty-nine = _______

C. IDENTIFY LITRES AS A UNIT OF MEASUREMENT

What is capacity? Capacity is how much liquid a container can hold.

What is a litre? A litre (L) is the main unit for measuring liquids.

Examples of containers and their capacity:

• Small water bottle = 500mL (half litre)
• Large water bottle = 1L
• Bucket = about 10L
• Jerry can = 20L
• Car fuel tank = about 50L

Understanding millilitres (mL):

• 1 litre (L) = 1000 millilitres (mL)
• 500mL = 0.5L (half litre)
• 250mL = 0.25L (quarter litre)

Converting between litres and millilitres:

1. 2L = _____ mL
2. 3L = _____ mL
3. 1500mL = _____ L
4. 2500mL = _____ L
5. 500mL = _____ L

Choose the right unit (L or mL):

1. Capacity of a cup: 200___
2. Capacity of a swimming pool: 5000___
3. Capacity of a medicine spoon: 5___
4. Capacity of a cooking pot: 3___
5. Capacity of a tank: 1000___

D. MEASURING LIQUID WITH GRADUATED MEASURING CYLINDER

What is a measuring cylinder? A measuring cylinder is a tall container with marks showing different volumes.

Reading a measuring cylinder:

• Look at the water level
• Read the number at the water surface
• Always read at eye level

Sample measuring cylinder readings:

|     | 1000mL

|     | 900mL

|     | 800mL

|water | 700mL  ← Water level here = 700mL

|     | 600mL

|     | 500mL

|     | 400mL

|     | 300mL

|     | 200mL

|     | 100mL

Practice reading:

1. If water reaches 400mL mark = _____ mL
2. If water reaches 1000mL mark = _____ L
3. If water reaches 750mL mark = _____ mL
4. If water reaches 500mL mark = _____ L

Measuring different amounts:

1. To measure 2L, fill to _____ mL mark
2. To measure 1.5L, fill to _____ mL mark
3. To measure 0.8L, fill to _____ mL mark
4. To measure 2.5L, fill to _____ mL mark

Adding and subtracting liquid volumes:

Adding:

• 500mL + 300mL = 800mL
• 1L + 500mL = 1500mL = 1.5L
• 2L + 1L = 3L

Subtracting:

• 1000mL – 400mL = 600mL
• 2L – 500mL = 1500mL = 1.5L
• 5L – 2L = 3L

Practice calculations:

1. 600mL + 400mL = _____ mL = _____ L
2. 2L + 1.5L = _____ L
3. 1500mL – 800mL = _____ mL
4. 3L – 1.2L = _____ L
5. 750mL + 250mL = _____ mL = _____ L

E. QUANTITATIVE REASONING

Word problems:

1. Kemi drinks 250mL of water 4 times a day. How much water does she drink in total?
2. A bucket holds 8L of water. Tolu pours out 3L. How much water is left?
3. Ada fills 3 bottles with 500mL each. What is the total volume of water?
4. A tank has 50L of water. 15L is used for washing and 20L for cooking. How much water remains?

Real-life measuring problems:

1. Recipe problem:
   1. A recipe needs 750mL of milk
   2. You have a 1L container
   3. How much milk will be left after using the recipe amount?
2. Garden watering:
   1. 5 plants need 200mL of water each
   2. How much water is needed in total?
   3. How many 1L bottles of water are needed?
3. Cooking problem:
   1. A pot can hold 4L of soup
   2. You make 2.5L of soup
   3. How much more soup can the pot hold?

Comparing capacities: Which holds more?

1. 1200mL or 1L? _____
2. 2.5L or 2800mL? _____
3. 1500mL or 1.3L? _____
4. 3L or 2900mL? _____

Estimation: Estimate the capacity:

1. A tea cup: about _____ mL
2. A bath tub: about _____ L
3. A car’s fuel tank: about _____ L
4. A medicine bottle: about _____ mL

Pattern recognition:

1. 100mL, 200mL, 300mL, _____, _____
2. 1L, 2L, 3L, _____, _____
3. 250mL, 500mL, 750mL, _____, _____

CLASS EXERCISES

1. Count from 948 to 958:
2. Write in words:
   1. 947 = _______
   2. 953 = _______
   3. 960 = _______
3. Convert capacities:
   1. 4L = _____ mL
   2. 2000mL = _____ L
   3. 6L = _____ mL
   4. 3500mL = _____ L
4. Choose the right unit (L or mL):
   1. Capacity of a swimming pool: 2000___
   2. Capacity of a glass: 250___
   3. Capacity of a water tank: 500___
   4. Capacity of a teaspoon: 5___
5. Read the measuring cylinder:
   1. Water at 600mL mark = _____ mL
   2. Water at 1000mL mark = _____ L
   3. Water at 1500mL mark = _____ L
6. Add capacities:
   1. 400mL + 300mL = _____ mL
   2. 1.5L + 2L = _____ L
   3. 800mL + 700mL = _____ mL = _____ L
7. Subtract capacities:
   1. 1000mL – 350mL = _____ mL
   2. 4L – 1.5L = _____ L
   3. 2000mL – 800mL = _____ mL
8. Compare capacities:
   1. Which is more: 1500mL or 1.3L? _____
   2. Which is less: 2L or 2200mL? _____
9. Word problems:
   1. A jug holds 2L of juice. 750mL is poured out. How much juice is left?
   2. Emeka drinks 300mL of water 3 times. How much water did he drink in total?
10. Problem solving: A recipe calls for 1.5L of water. You have a measuring cylinder that shows measurements up to 1000mL. How would you measure 1.5L of water using this cylinder?