Curriculum Shule Direct Zanzibar Primary Standard IV Mathematics

Mathematics

DECIMALS
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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
Identify number of decimal places
Activity 36
Go through the following expalanation
Exercise 27
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
Read decimals correctly
Activity 37
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 8
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 28
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
Write decimals
Activity 38
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 29
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
Perform calculations involving decimals with one decimal place
Activity 39
Observe the following examples of addition of decimal numbers with one decimal place
Exercise 30
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 31
Do the following exercises
Activity 40
Subtraction of decimal numbers with one decimal place. Observe the following examples and then perform the exercise
Exercise 32
Perform the following operation
Perform calculations involving decimals with more than one decimal places
Perform calculations involving decimals with more than one decimal places
Activity 41
Study the following examples of adding decimal numbers with more than one decimal places
Exercise 33
Add the following numbers
Activity 42
Study the subtraction of decimal numbers with more than one decimal places
Exercise 34
Work the following operation
Apply operations on solving word problems on decimals
Apply operations on solving word problems on decimals
Example 9
Study the following examples and then do exercise
Exercise 35
Listening to this topic

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