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Ordering numbers and adding in any order

الأسبوع 7 · ترتيب الأعداد والجمع بأي ترتيب · 3 دروس
2

Ordering a number game

Discover Mathematics P2: Term 1, Lessons 21–30
GoalPlay a card game: order five numbers and check each neighbour.
New words
neighbour · the number next to another numbercheck · to make sure the answer is rightcard · a small piece of paper with a number
Explanation

Here is a game. Write five numbers on five cards. Put the cards in order from least to greatest. Then check: compare each card with the card next to it. The left card must be less than the right card every time. If one pair is wrong, swap the cards and check again.

4505440545504
Worked examples
4554405450504
Cards: 450, 54, 405, 45, 504. Least to greatest: 45, 54, 405, 450, 504.
Check the neighbours: 405 and 450 have 4 hundreds. Tens: 0 is less than 5, so 405 < 450. Good.
621216162126
Mina’s cards 621, 126, 216, 162, from greatest to least: 621, 216, 162, 126.
Class activity

Play with number cards. Make cards for any numbers up to 999. Deal five cards each, order them, and let your partner check. Every correct row scores one point.

Practice
1
Write these cards with the smallest number first.
811118188181
2
Karim ordered: 230, 320, 203. Is the row correct? Fix it if not.
3
Which card is the greatest: 99, 109 or 190?
4
Which card goes between 250 and 270?
5
Put in order from greatest to least: 75, 570, 507, 57.