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Delta Modern Language Schools
Primary stage Grade 5
Math department
1st term 2024/2025
Unit (2) : Number relationships
• Concept (1)
Sameh saved 25 L.E to buy his favorite meal which coasts
52 L.E.How much does Sameh need to save more?
You can translate this problem into a mathematical
statement contains a missing number as
25 +? = 52
If you replace the missing number by any letter (x, y, a,
b,…) you will get :
25 + x = 52
variable
Mathematical expression Equation
Mathematical expression is statement Equation is a mathematical
contains numbers or numbers and symbols expression contains the equal sign “
separated by one or more operations as ( +
, - , x ,÷ ) and doesn’t contains the equal =”
sign “ = ” Examples:
Examples: • 24.8 – x = 1.5
• 10 x 2 ÷ 5 • 36.5 + 14.1 = k
• 42 ÷ k • 4.2 + 1.5 = 8.9 – 3.2
• 7.4 + 2.5 -15
• 7.36 + 1.036 + 2.5 = b
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