Curriculum Shule Direct Zanzibar Primary Standard IV Mathematics

Mathematics

DECIMALS

DECIMALS

In this topic, student learn about decimals—numbers that represent parts of a whole. It focus on identifying decimal places, reading decimals correctly, and writing decimals. They also learn arithmetic operations with decimals, starting with addition and subtraction of numbers with one decimal place and then moving to more than one decimal place.
Concept of decimals
A decimal number is a number that includes a decimal point (.) to show parts of a wholeExamples of decimal numbers are: 2.8, 1.03, 0.1, 0.06
Identify number of decimal places
Activity 1
Go through the following expalanation
Exercise 1
Write the number of decimal places for each number.
  1. 4.6
  2. 9.2
  3. 12.45
  4. 0.8
  5. 5.67
  6. 3.0
  7. 8.91
  8. 0.02
  9. 3.49
  10. 0.2
Read decimals correctly
Activity 2
How to read decimal numbers
  1. Read the whole number part normally.
  2. Say “point” for the decimal.
  3. Read each digit after the decimal individually (not as a whole number).
Example 1
Study the following examples
  • 1. 12.45 read as “Twelve point four five”
  • 2. 0.07 read as “Zero point zero seven”
  • 3. 8.9 read as “Eight point nine”
  • 4. 123.04 read as “One hundred and twenty-three point zero four”
  • 5. 3.46 read as “three point four six”
Exercise 2
Read each decimal number correctly
  1. 3.8
  2. 6.02
  3. 132.01
  4. 0.02
  5. 25.9
  6. 8.96
  7. 0.08
  8. 18.46
  9. 39.40
  10. 3.00
Write decimals
Activity 3
Read the following information clearly Decimal numbers are written using a decimal point (.) to separate whole numbers from parts of a whole.Observe the following examples and then do the exercise by your self
  1. Zero point four 0.4
  2. Zero point nine 0.9
  3. One point five 1.5
  4. Two point seven 2.7
  5. Three point two five 3.5
  6. Four point eight 4.8
  7. Five point six zero 5.60
  8. Six point one four 6.14
  9. Seven point zero three 7.03
  10. Nine point seven five 9.75
Exercise 3
Write each decimal number using digits.
  1. Zero point five
  2. Three point two
  3. Seven point four
  4. One point eight
  5. Nine point six
  6. Four point three five
  7. Six point zero nine
  8. Two point seven four
  9. Eight point one two
Arithmetic operations involving decimals (+ and -)
Perform calculations involving decimals with one decimal place
Activity 4
Observe the following examples of addition of decimal numbers with one decimal place
Exercise 4
Add the following decimals
  1. 2.6 + 3.3
  2. 7.4 + 2.4
  3. 0.07 + 0.02
  4. 1.25 +3.42
  5. 0.09 + 1.26
  6. 3.20 + 2. 46
  7. 8.36 + 1.34
  8. 10.25 + 12. 26
  9. 0.05 +0.08
  10. 20.25 + 12.17
Exercise 5
Do the following exercises
Activity 5
Subtraction of decimal numbers with one decimal place. Observe the following examples and then perform the exercise
Exercise 6
Perform the following operation
Perform calculations involving decimals with more than one decimal places
Activity 6
Study the following examples of adding decimal numbers with more than one decimal places
Exercise 7
Add the following numbers
Activity 7
Study the subtraction of decimal numbers with more than one decimal places
Exercise 8
Work the following operation
Apply operations on solving word problems on decimals
Example 2
Study the following examples and then do exercise
Exercise 9
Listening to this topic

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