One number, four questions

Same surface, different depth · 1st grade · Place value to 100

Ink Designed Plain black & white All SSDD sheets

One number, four questions Grade 1 · Place value to 100

Name
Date

Read this first

Every question is about 47. Each one wants something different from it.

All four questions are about this

The number is 47.

1Four different questionsThey look alike. They are not. Answer each one.

a)How many tens are in 47?

b)How many ones are in 47?

c)What is 10 more than 47?

d)What is 1 less than 47?

Scratch space — work it out here

Nice work! Colour a star for every one you get right.

izzimath · Grade 1 · seed 0 · 1.NBT.B.2, 1.NBT.C.5
Same surface, four different methods. The key names the method each one needed.

One number, four questions Grade 1 · Place value to 100

Name
Date

All four questions are about this

The number is 47.

1Four different questionsEach answer with the method it needed.

a)How many tens are in 47?

4 Read the tens digit

The left digit counts tens. 47 is 4 tens and 7 ones.

b)How many ones are in 47?

7 Read the ones digit

The right digit counts ones. Same number, different column.

c)What is 10 more than 47?

57 Add a ten — only the tens digit moves

4 tens becomes 5 tens. The 7 ones do not change, so 57.

d)What is 1 less than 47?

46 Count back one — only the ones digit moves

One less than 7 ones is 6 ones. The 4 tens do not change, so 46.

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 1 · seed 0 · 1.NBT.B.2, 1.NBT.C.5

Why four questions is the whole sheet

A column of twenty subtractions trains the procedure. It cannot train deciding which procedure the question wants, because on a page of subtraction the answer to “what do I do here” is always the same. That decision is where most mistakes on mixed work come from.

So these four questions share one surface — The number is 47. — and need four different methods. The answer key names the method each one wanted, which is the column to read together afterwards.

The format is Craig Barton's, published as a large open bank at ssddproblems.com. These sets are ours; the idea is his.