New
New
Year 3

Find 10 more or 10 less than a given number

I can find 10 more and 10 less than a number up to 200

New
New
Year 3

Find 10 more or 10 less than a given number

I can find 10 more and 10 less than a number up to 200

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Lesson details

Key learning points

  1. When you count in tens, the ones digit stays the same.
  2. When you count in tens, the tens and hundreds digits may change.
  3. Knowledge of place value can help when counting forwards across the 100 boundary.

Common misconception

Pupils may make errors when crossing the 100s boundary, either when adding or subtracting.

Emphasise that ten 10s are equal to 100. When using base ten blocks, pupils should be encouraged to change ten 10s into one hundred.

Keywords

  • Multiple - The result of multiplying a number by another whole number.

  • 100s boundary - The point at which the numbers change into 100s numbers, or from one set of hundreds to another.

Many pupils will find base ten blocks helpful to represent the problems in this lesson. They may also find number lines representations helpful too. Both support pupils in seeing the relative size of the numbers they are calculating with.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

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6 Questions

Q1.
What number comes next? 10, 20, 30...
Correct Answer: 40, forty
Q2.
What number comes next? 80, 70, 60...
Correct Answer: 50, fifty
Q3.
What number is represented by the base ten blocks?
An image in a quiz
40
50
Correct answer: 60
70
Q4.
What number is represented by the arrow?
An image in a quiz
Correct Answer: 75, seventy-five
Q5.
What is the missing number? + 1 = 100
Correct Answer: 99, ninety nine
Q6.
Match the equations to their answers.
Correct Answer:94 + 1 =,95

95

Correct Answer:94 − 1 =,93

93

Correct Answer:93 + 1 = ,94

94

Correct Answer:93 − 1 =,92

92

6 Questions

Q1.
What is 130 + 10?
104
120
131
Correct answer: 140
Q2.
What is 160 − 10?
Correct Answer: 150, one hundred and fifty
Q3.
What is 143 + 10?
133
144
Correct answer: 153
Q4.
Use the number line representation to help you calculate 123 − 10
An image in a quiz
103
Correct answer: 113
122
143
Q5.
What is 10 more than 94?
95
Correct answer: 104
106
114
Q6.
Pedro has a mass of 107 kg. Ping is 10 kg lighter. What is Ping's mass in kg?
An image in a quiz
Correct Answer: 97, 97 kg, ninety-seven