Two numbers, four questions
Grade 2 · Add and subtract within 100
Name
Date
Date
Read this first
The same two numbers every time. Look at what each question actually asks for.
All four questions are about this
The two numbers are 63 and 28.
1Four different questionsThey look alike. They are not. Answer each one.
a)Add them.
b)Take the smaller from the larger.
c)Round each one to the nearest ten.
d)Is 63 − 28 more or less than 40? Answer without working it out.
Scratch space — work it out here
How did it go?
Tick one for every question you got right.
izzimath · Grade 2 · seed 0 · 2.NBT.B.5, 2.NBT.A.1, 2.NBT.A.4
Same surface, four different methods. The key names the method each one needed.
Same surface, four different methods. The key names the method each one needed.
Two numbers, four questions
Grade 2 · Add and subtract within 100
Name
Date
Date
All four questions are about this
The two numbers are 63 and 28.
1Four different questionsEach answer with the method it needed.
a)Add them.
91
Add with regrouping
3 + 8 is 11, so write 1 and carry a ten. 6 + 2 + 1 is 9 tens. 91.
b)Take the smaller from the larger.
35
Subtract with borrowing
You cannot take 8 from 3, so borrow a ten: 13 − 8 is 5, and 5 − 2 is 3. 35.
c)Round each one to the nearest ten.
60 and 30
Round — no calculating at all
63 is nearer 60 than 70. 28 is nearer 30 than 20. Nothing is added or subtracted here.
d)Is 63 − 28 more or less than 40? Answer without working it out.
less
Estimate and justify — no exact answer wanted
Round first: about 60 − 30 is about 30, which is less than 40. The rounded numbers are enough to decide.
For the grown-up. If they get stuck, work through the
first one together, then hand it back. Reading the working aloud is worth more than marking
it — feedback that explains is worth several times feedback that only says right or
wrong, and the gap is wider in maths than in any other subject.
izzimath · Grade 2 · seed 0 · 2.NBT.B.5, 2.NBT.A.1, 2.NBT.A.4