Starter quiz
- Complete the sentence. I know that 6 + 1 = 7 so ______.
- 60 - 10 = 50
- 60 + 10 = 70 ✓
- 80 - 10 = 70
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- Complete the sentence. I know that 8 - 1 = 7 so ______.
- 80 + 10 = 90
- 80 - 10 = 70 ✓
- 60 + 10 = 70
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- Ten more than 30 is ______
- 50
- 40 ✓
- 30
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- Ten less than 60 is ______
- '50' ✓
- Match the equation to the correct multiple of 10
- 40 + 10 =⇔50 ✓
- 10 + 50 =⇔60 ✓
- 50 - 10 =⇔40 ✓
- 40 - 10 =⇔30 ✓
Jun thinks he has represented 40 + 10 = 50 but he is incorrect. What equation does this represent?- 40 + 10 = 50
- 30 - 10 = 20
- 30 + 10 = 40 ✓
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Exit quiz
- Which representation matches 4 tens + 1 ten = 5 tens?
Which equation is being represented?- 6 tens subtract 4 tens =
- 6 tens add 2 tens =
- 6 tens subtract 2 tens = ✓
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- Match the statements.
- I know that 4 plus 2 is equal to 6⇔so 4 tens plus 2 tens is equal to 6 tens. ✓
- I know that 5 plus 3 is equal to 8⇔so 5 tens plus 3 tens is equal to 8 tens. ✓
- I know that 2 plus 5 is equal to 7⇔so 2 tens plus 5 tens is equal to 7 tens. ✓
- Complete the equation 6 tens = 3 tens + ______ tens
- 2
- 3 ✓
- 5
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- Which representation could show 6 tens subtract 4 tens is equal to 2 tens?
- Alex says, “I know that 7 minus 4 is equal to 3”. Which of the following equations would Alex’s statement help to solve?
- 7 tens add 3 tens =
- 7 tens subtract 4 tens = ✓
- 4 tens subtract 3 tens =
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Worksheet
Presentation
Video
Lesson Details
Key learning points
- Tens numbers can be added to or subtracted from a multiple of ten.
- When you add a tens number to a multiple of ten the tens number increases.
- When you subtract a tens number from a multiple of ten the tens number decreases.
- If 3 + 1 is equal to 4 then 3 tens + 1 ten is equal to 4 tens which is equal to 40
- If 4 - 1 is equal to 3 then 4 tens subtract 1 ten is equal to 3 tens which is equal to 30
Common misconception
Children may use counting on and back strategies instead of application of known facts and therefore be inefficient when adding and subtracting multiples of 10
Use representations to make clear links when unitising e.g. adding 2 to 3 and then adding 2 groups of 10 to 3 groups of 10, to support children in making the link. Children should be increasingly fluent in addition and subtraction within 10
Keywords
Add - To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
Plus - To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
Subtract - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Minus - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.