Expression, equation, formula or inequality?

The Maths Habit

Which one is the odd one out? Why?

5 + 2
A
5 + 2 = 7
B
5 + 2 > 6
C

Each one can be. A has no sign. B has an = sign. C has a > sign.

How many letters?

4m + 1
A
1
A = bh
B
3
d + e
C
2

=
Expression
Numbers and letters with no = sign.
=?
Equation
Has an = sign and one letter.
=??
Formula
Has an = sign and two or more letters.
<>≤≥
Inequality
Has <, >, ≤ or ≥.

Which word?

NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
  1. 1Is there an = sign?Look for =.
    No = sign: an expression.
  2. 2Two or more letters?Count the letters.
    One letter: an equation.
    Two or more: a formula.
  3. 3Write the word.

Circle Yes or No at each step.

4y + 3 = 11
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerequation

Circle Yes or No at each step.

V = 3h
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerformula

Circle Yes or No at each step.

4y + 3 = 11
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerequation

Circle Yes or No at each step.

T = 5m
no = sign expression= and one letter equation= and two or more letters formula
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerformula

Circle Yes or No at each step.

4y + 3 = 11
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerequation

Circle Yes or No at each step.

7b = 21
no = sign expression= and one letter equation= and two or more letters formula
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerequation

Circle Yes or No at each step.

4y + 3 = 11
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerequation

Circle Yes or No at each step.

6 + 2c
no = sign expression= and one letter equation= and two or more letters formula
NoYesIs there an = sign?1NoYesTwo or moreletters?2expressionequationformula3
3Answerexpression

Which word is each one?

no = sign expression= and one letter equation= and two or more letters formula
12g − 1NoYesIs there an = sign?NoYesTwo or moreletters?expressionequationformula
3Answerexpression
29 = 4 + fNoYesIs there an = sign?NoYesTwo or moreletters?expressionequationformula
3Answerequation
3C = 3n + 2NoYesIs there an = sign?NoYesTwo or moreletters?expressionequationformula
3Answerformula

Is there <, >, ≤ or ≥?

x + 3 > 7
A
Yes
x + 3 = 7
B
No
4 ≤ k
C
Yes
3y
D
No

A new branch: inequality

NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
  1. 1Is there an = sign?Look for =.
  2. 2Is there <, >, ≤ or ≥?Ask it after a No.
    Yes: an inequality.
    No: an expression.
  3. 3Write the word.

Circle Yes or No at each step.

2n + 1 < 9
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerinequality

Circle Yes or No at each step.

5h − 2
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerexpression

Circle Yes or No at each step.

2n + 1 < 9
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerinequality

Circle Yes or No at each step.

m − 4 > 6
no = sign expression<, >, ≤ or ≥ inequality= and one letter equation= and two or more letters formula
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerinequality

Circle Yes or No at each step.

2n + 1 < 9
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerinequality

Circle Yes or No at each step.

9 + 5c
no = sign expression<, >, ≤ or ≥ inequality= and one letter equation= and two or more letters formula
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerexpression

Circle Yes or No at each step.

2n + 1 < 9
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerinequality

Circle Yes or No at each step.

3w ≤ 15
no = sign expression<, >, ≤ or ≥ inequality= and one letter equation= and two or more letters formula
NoYesIs there an = sign?1NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?2expressioninequalityequationformula3
3Answerinequality

Which word is each one?

no = sign expression<, >, ≤ or ≥ inequality= and one letter equation= and two or more letters formula
16r ≥ 18NoYesIs there an = sign?NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?expressioninequalityequationformula
3Answerinequality
2H = 4gNoYesIs there an = sign?NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?expressioninequalityequationformula
3Answerformula
37 + 2qNoYesIs there an = sign?NoYesIs there<, >, ≤ or ≥?NoYesTwo or moreletters?expressioninequalityequationformula
3Answerexpression

Is the word correct? Thumbs up or thumbs down.

A3y − 2 is an equation.No: an expression
BV = 5h is a formula.Correct
C6 > k is an inequality.Correct
Dd + 4 = 9 is a formula.No: an equation

Expression, equation, formula or inequality? worksheet, page 1

Expression, equation, formula or inequality? worksheet, page 2

Answer sheet

  1. Write an expression. Use the letter n.

    n + 3, for example

  2. Write a formula. Use the letters A and b.

    A = 5b, for example

  3. Change the sign in 4m + 1 = 9 to make an inequality.

    4m + 1 > 9, for example

  1. Which word is 2p + 5 = 11? Circle Yes or No at each step.

    1 Is there an = sign?YesNo
    2 Two or more letters?YesNo

    3 Word = equation

  2. Which word is h − 2 > 4? Circle Yes or No at each step.

    1 Is there an = sign?YesNo
    2 If yes: Two or more letters?YesNo
    2 If no: Is there <, >, ≤ or ≥?YesNo

    3 Word = inequality

  3. Which word is A = 3c?

    Word = formula
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