Primary 2 - Math
Chapter 2: Place Value, Addition and Subtraction up to 100
Place Value Houses: Exploring Tens and Ones up to 100 🏠🔢
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Welcome, brilliant math wizards of Primary 2! Every digit in a number lives in a special house with its own value. When we look at a two-digit number like 64, the digit on the right (4) lives in the 'Ones place' and is worth 4 single units. The digit on the left (6) lives in the 'Tens place' and represents 6 bundles of ten, which equals 60! We can write any number in three wonderful ways: Standard Form (64), Expanded Form (60 + 4), and Word Form (sixty-four). Let us explore numbers up to 100 together!
🏠 The Place Value Chart (e.g., 73)
- 🟡 Ones place: 3 ones = value of 3.
- 🔵 Tens place: 7 tens = value of 70.
- 💎 Total Value: 70 + 3 = 73.
📝 Three Ways to Express a Number
- 🔹 Standard Form: 85
- 🔹 Expanded Form: 80 + 5
- 🔹 Word Form: eighty-five
🧩 Number Decomposition Matrix
| Standard Form | Tens | Ones | Expanded Form | Word Form |
|---|---|---|---|---|
| 47 | 4 (value 40) | 7 (value 7) | 40 + 7 | forty-seven |
| 92 | 9 (value 90) | 2 (value 2) | 90 + 2 | ninety-two |
| 50 | 5 (value 50) | 0 (value 0) | 50 + 0 | fifty |
| 38 | 3 (value 30) | 8 (value 8) | 30 + 8 | thirty-eight |
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place value
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القيمة المكانية للخانة
📖 Def: the numerical value that a digit has by virtue of its position in a number
value of digit
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قيمة الرقم الحسابية
📖 Def: the worth of a digit depending on where it is located
tens
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خانة العشرات
📖 Def: the place value representing groups of ten
ones
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خانة الآحاد
📖 Def: the place value representing single units from 0 to 9
standard form
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الصيغة القياسية الرمزية بالأرقام
📖 Def: writing a number using digits only, such as 56
expanded form
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الصيغة الممتدة التفكيكية
📖 Def: writing a number to show the value of each digit, such as 50 + 6
word form
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الصيغة اللفظية المكتوبة بالكلمات
📖 Def: writing a number using words, such as fifty-six
digit
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الرقم الفردي
📖 Def: any of the numerals from 0 to 9
two-digit number
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عدد مكون من رقمين
📖 Def: a number ranging from 10 to 99
one hundred
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العدد مئة (100)
📖 Def: the number 100, which equals 10 tens
base-ten rod
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عمود العشرات النموذجي
📖 Def: a math manipulative representing a group of 10
unit cube
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مكعب الآحاد الفردي
📖 Def: a small math block representing 1 single unit
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