22. Subtraction 3


Tens and Units Can you remember the rule for subtracting tens and units?


 First subtract the units.  Then subtract the tens.


Now try this one . . . 54 – 7 = You can’t take away 7


from 4. What do you do now?


Now try these: 1. tu


tu RENAME! 5 4


C 33 C 3. tu 36 C 5. tu 52 C Strand: Number 76


Curriculum Objectives: Develop an understanding of subtraction as deducting, as complementing and as difference; develop and recall mental strategies for subtraction 0–20;


2 3 1


tu 2. tu 3


44 C –7 –7 – 8 tu 4. tu 63 C –9 –9 – 5


tu 6. tu 7 1


–5 –5 – 7 C tu 4 5 1 4


–7 –7 4 7


tu – 8 tu – 5 tu – 7


construct number sentences involving subtraction of whole numbers; solve problems involving subtraction; estimate differences within 99; subtract numbers without and with renaming within 99; solve one-step and two-step problems involving subtraction.


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