Primary 2 - Math
Chapter 2: Place Value, Addition and Subtraction up to 100
The Hungry Alligator: Comparing with >, <, and = 🐊⚖️
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Get ready for a comparison challenge! Remember our hungry alligator: its wide open mouth always points toward the greater number because it loves bigger snacks! To compare two-digit numbers, our golden rule is to look at the 'Tens digit' first. The number with more tens is always greater (e. g., 61 > 59 because 6 tens > 5 tens). If the tens digits are identical, we look at the 'Ones digit' to decide. We also learn to order numbers in ascending order (least to greatest) and descending order (greatest to least)!
⚖️ Steps to Compare 2-Digit Numbers
- 1️⃣ Compare the Tens first:
Comparing 74 and 58: 7 tens > 5 tens ➔ 74 > 58. - 2️⃣ If Tens are equal, compare the Ones:
Comparing 83 and 87: 8 tens = 8 tens, but 3 ones < 7 ones ➔ 83 < 87. - 3️⃣ If both Tens and Ones are equal: Use the equal sign (=).
🪜 Ascending vs Descending Order
- 📈 Ascending (Least to Greatest): Going up the ladder.
18 ➔ 35 ➔ 62 ➔ 89. - 📉 Descending (Greatest to Least): Going down the ladder.
89 ➔ 62 ➔ 35 ➔ 18.
🧩 Comparing Practice Table
| First Number | Sign | Second Number | Mathematical Reason |
|---|---|---|---|
| 91 | > | 79 | 9 tens is greater than 7 tens |
| 46 | < | 48 | Tens are equal, 6 ones is less than 8 ones |
| 60 | = | 60 | Exact same number of tens and ones |
| 25 | > | 19 | 2 tens is greater than 1 ten |
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compare
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يقارن بين قيمتين
📖 Def: to estimate, measure, or note the similarity or dissimilarity between two quantities
greater than (>)
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أكبر من
📖 Def: a symbol used to show that the first number is larger than the second
less than (<)
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أصغر من
📖 Def: a symbol used to show that the first number is smaller than the second
equal to (=)
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يساوي
📖 Def: a symbol indicating that two quantities have the exact same value
ascending order
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ترتيب تصاعدي (من الأصغر للأكبر)
📖 Def: arranging numbers from the smallest to the largest
descending order
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ترتيب تنازلي (من الأكبر للأصغر)
📖 Def: arranging numbers from the largest to the smallest
least
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الأصغر قيمة
📖 Def: the smallest in size, amount, or degree
greatest
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الأكبر قيمة
📖 Def: the largest in size, amount, or degree
before
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العدد السابق
📖 Def: the number that comes immediately earlier on the number line (-1)
after
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العدد التالي
📖 Def: the number that comes immediately next on the number line (+1)
between
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العدد الواقع بين قيمتين
📖 Def: in the middle of two numbers on a number line
number line
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خط الأعداد
📖 Def: a straight line on which numbers are marked at intervals
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