**SUBJECT: MATHEMATICS**

**CLASS: JSS 1**

**DATE:**

**TERM: 2nd TERM**

**REFERENCE BOOKS**

- New General Mathematics, Junior Secondary Schools Book 1
- Essential Mathematics for Junior Secondary Schools Book 1

WEEK SIX** **** **** **** **** **** **** Date:……………….**

**TOPIC: BASIC OPERATIONS**

**CONTENT:**

**Addition of Numbers ( Place Values)****Subtraction of Numbers ( Place Values)**

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**Addition of Numbers **

**The easiest method of adding or subtracting numbers is by having the knowledge of place value system. By this system of arrangement, all units ( U), Tens (T), Hundreds (H), Thousands ( T), and so, are vertically arranged in line. Note that numbers are written from right to left by their place values. **

**Example 1**

**Add the following numbers: 1092, 84, 8, 183.**

**Solution **

Th H T U 1 9 9 2 8 4 + 8 1 8 3 2 2 6 7 | Method U = 2 + 4+ 8+ 3 = 17 ( write 7 under U and carry 1 to the T column) T = 9 + 8 + 8 + (1) = 26 ( write 4 and carry 2 to the H column) H = 0 + 1 + (1) = 2 ( write 2 under H and carry 1 to Th) Th = 1 + (1) = 2 ( write 2 under the Th) |

**Example 2**

**Ukachi has 1578 apples, jide has 682 apples and victor has 88 apples. How many apples do they have all together?**

**Solution**

TH H T U 1 5 7 8 + 6 8 2 8 8 2 3 4 8 |

** **

**Example 3**

**A man spent #2500 on housing, #1245 on savings, #3480 on feeding and #248 on the children’s education. How much did he spend altogether? **

**Solution**

TH H T U 2 5 0 0 1 2 4 5 3 4 8 0 2 4 8 7 4 7 3 |

**Evaluation:**

**Find the sum of 76,721, 2393, 184 and 96.****A man earned N73485.00 three years ago N 98472.00 a year ago and N124390.00 this year. How much altogether did he earn for the three years?**

** **

**Subtraction of Numbers**

**Example 1**

**The sum of two numbers is equal to 67512. If one of the numbers is 24351, what is the second number? **

**Solution**

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TTH TH H T U 6 7 5 1 2 - 2 4 3 5 1 4 3 1 6 1 |

**Evaluation:**

**There are 24 students in a class which comprises of 14 girls and 10 boys. If 5 girls and 3 boys were absent, how many students are present in the class?****Find the difference between 10342 and 2015**

**General Evaluation **

**A man borrowed N120 from a friend and borrowed N350 from his brother. How much is his total debt?****The temperature inside a room was recorded at 20oC and the temperature outside was measured as -8oC. How many degrees warmer was the room temperature more than the outside temperature?**

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**Reading Assignment:**

**Essential Mathematics for JSS1, pages 8 and 9**

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**Weekend Assignment**

**1.By how many is 29 greater than 17? (a)12 (b)18 (c)19 (d)17**

**Simplify 79001- 73776 (a)105225 (b)5335 (c)5225 (d)5221****When you increase the sum of 345 and 1276 by 1453, the result will give (a)2074 (b)5023 (c)1453 (d)3074**

**4.There are 816 boys and 658 girls in a school. How many students are there altogether in the school? (a)1356 (b)1474 (c)1744 (d)1074**

**5.Find the difference between 8074 and 5729(a)2345 (b)5432 (c)5745 (d)4365**

**Theory**

**(1)The difference between two numbers is 603904.If the first number is 21432, what is the second number?**

**(2)Find the sum of the following numbers: 95,3, 2134, 93627, 18, and 543.**

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