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Year 2 in England

1st grade number sense

19 1st grade number sense skills, each with a worked example, free practice that checks every answer, and a printable worksheet. Start with a mixed review, or jump to the skill you need.

Mixed review

Ten questions drawn from every skill below.

Print a review worksheetRiddle puzzle on screenBingo

Tens and ones

CCSS 1.NBT.B.2England: Y1 Number and place valueEngland: Y2 Number and place value

Example

74 = 7 tens and how many ones?

  1. 74 = 70 + 4
  2. 7 tens and 4 ones.
  3. 4

Answer: 4

Builds on: Teen numbers: ten and some ones, Count to 100 by ones and tens

Leads to: Compare two-digit numbers, Hundreds, tens and ones, Add and subtract tens, Add two-digit numbers with regrouping

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Count to 120

CCSS 1.NBT.A.1England: Y1 Number and place value

Example

Count on in tens: 68, 78, 88, __

  1. 88 + 10 = 98

Answer: 98

Builds on: Count to 100 by ones and tens

Leads to: Skip count by 2s, 5s, 10s and 100s, Move around a number grid to 120, Count backwards within 120, Count on and back across hundreds (to 1000)

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Compare two-digit numbers

CCSS 1.NBT.B.3England: Y1 Number and place valueEngland: Y2 Number and place value

Example

Choose the sign that makes this true: 79 __ 97

  1. 79 has 7 tens, 97 has 9 tens.
  2. 79 < 97

Answer: <

Builds on: Tens and ones, Compare numbers to 10

Leads to: Compare three-digit numbers, Compare two-digit numbers with <, > and =, Put two-digit numbers in order

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Move around a number grid to 120

CCSS 1.NBT.A.1CCSS 1.NBT.C.5England: Y1 Number and place valueEngland: Y2 Number and place value

Example

On a number grid with rows of ten, which number is just above 107?

  1. 107 − 10 = 97
  2. 97

Answer: 97

Builds on: Count to 120, Missing numbers on a hundred square

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Count in twos

CCSS 1.OA.C.5England: Y1 Number and place value

Example

Count in twos. What is missing? 10, 12, 14, __, 18

  1. 14 + 2 = 16
  2. 16

Answer: 16

Builds on: Count to 100 by ones and tens

Leads to: Count in threes, Odd or even? Check by making pairs, Count groups of the same coin, Pictograms where each picture stands for 2

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Count in fives

CCSS 1.OA.C.5England: Y1 Number and place value

Example

Count in fives. What is missing? 5, 10, 15, __, 25

  1. 15 + 5 = 20
  2. 20

Answer: 20

Builds on: Count to 100 by ones and tens

Leads to: Count groups of the same coin, Read and make tally marks, Count objects in equal groups

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Count in tens from any number

CCSS 1.NBT.C.5England: Y1 Number and place valueEngland: Y2 Number and place value

Example

Count on in tens: 17, 27, 37, __, 57

  1. 37 + 10 = 47
  2. 47

Answer: 47

Builds on: Count to 100 by ones and tens, Tens and ones

Leads to: Skip count by 5s, 10s and 100s from any number

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Count backwards within 120

CCSS 1.NBT.A.1England: Y1 Number and place value

Example

Count back: 60, 59, 58, __

  1. 58 − 1 = 57
  2. 57

Answer: 57

Builds on: Count back from 10 and from 20, Count to 120

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Make a sensible estimate

CCSS 1.NBT.A.1England: Y2 Number and place value

Example

Without counting one by one, which is the best estimate for the number of hearts? ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥

  1. There are 52, which is close to 50.
  2. About 50.

Answer: about 50

Builds on: Count to 100 by ones and tens

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Bundles of ten and loose ones

CCSS 1.NBT.B.2aCCSS 1.NBT.B.2cEngland: Y1 Number and place valueEngland: Y2 Number and place value

Example

You have 80 straws and tie them in bundles of 10. How many loose straws are left over?

  1. 80 = 80 + 0
  2. 0 left over.

Answer: 0

Builds on: Teen numbers: ten and some ones

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What each digit is worth in a two-digit number

CCSS 1.NBT.B.2England: Y2 Number and place value

Example

In 43, what is the digit 4 worth?

  1. 43 = 40 + 3
  2. 40

Answer: 40

Builds on: Tens and ones

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Split two-digit numbers into tens and ones

CCSS 1.NBT.B.2England: Y1 Number and place valueEngland: Y2 Number and place value

Example

86 = __ + 6

  1. 86 = 80 + 6
  2. 80

Answer: 80

Builds on: Tens and ones

Leads to: The same number made in different ways with tens and ones, Spot the place-value mistake

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The same number made in different ways with tens and ones

CCSS 1.NBT.B.2aEngland: Y2 Number and place value

Example

What number is 7 tens and 16 ones?

  1. 70 + 16 = 86
  2. 86

Answer: 86

Builds on: Split two-digit numbers into tens and ones

Leads to: Rename numbers using hundreds, tens and ones

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Find 10 more and 10 less

CCSS 1.NBT.C.5England: Y1 Number and place valueEngland: Y2 Number and place value

Example

Liam has 43 crayons and gives a pack of 10 away. How many are left?

  1. 43 − 10 = 33
  2. 33

Answer: 33

Builds on: Tens and ones

Leads to: Find 10 or 100 more or less, Add tens to a two-digit number

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Compare two-digit numbers with <, > and =

CCSS 1.NBT.B.3England: Y1 Number and place valueEngland: Y2 Number and place value

Example

Choose the sign: 31 __ 46

  1. 31 < 46

Answer: <

Builds on: Compare two-digit numbers

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Put two-digit numbers in order

CCSS 1.NBT.B.3England: Y1 Number and place valueEngland: Y2 Number and place value

Example

Which number is the least? 34, 24, 42, 28

  1. 24 < 28 < 34 < 42
  2. 24

Answer: 24

Builds on: Compare two-digit numbers

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Find numbers on a number line to 100

CCSS 1.NBT.A.1CCSS 2.MD.B.6England: Y1 Number and place valueEngland: Y2 Number and place value

Builds on: Count to 100 by ones and tens

Leads to: Number lines to 1000, Estimate to check whether an answer is sensible, Show length sums and differences on a number line

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Read and write number words to 100

CCSS 1.NBT.A.1England: Y1 Number and place valueEngland: Y2 Number and place value

Example

Write "eighty-five" in digits.

  1. "eighty-five" = 85

Answer: 85

Builds on: Number words zero to ten, Tens and ones

Leads to: Read and write number words to 1000

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Spot the place-value mistake

CCSS 1.NBT.B.2England: Y1 Number and place valueEngland: Y2 Number and place value

Example

Amara says 2 tens and 4 ones make 24. Is Amara right?

  1. 20 + 4 = 24
  2. Yes, that is right.

Answer: Yes

Builds on: Split two-digit numbers into tens and ones

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1st grade Number sense: Practice and Worksheets | Eurekami