Add multiples of 10 to 2-digit numbers. | Maths | Quizalize & Oak National Academy

Starter quiz

Match to complete the equations.

10 + 55 =

⇔

65 ✓

39 + 10 =

⇔

49 ✓

10 + 43 =

⇔

53 ✓

89 + 10 =

⇔

99 ✓
Match to complete the equations.

29 − 10 =

⇔

19 ✓

37 − 10 =

⇔

27 ✓

55 − 10 =

⇔

45 ✓

61 − 10 =

⇔

51 ✓
10 + 64 = ______

'74' ✓
72 − 10 = ______

'62' ✓
Match two numbers that have a difference of 10

23

⇔

33 ✓

57

⇔

47 ✓

46

⇔

56 ✓

74

⇔

64 ✓
45 and ___ have a difference of 10

44

55 ✓

35 ✓

54

Exit quiz

Look at the number line. What equation is it showing?

35 + 10 =

35 + 20 =

35 + 30 = ✓
16 + 50 = ? How many tens are being added to 16 in this equation? ______ tens

'5' ✓
Which of the images represent this equation? 36 + 40 =
Match the known facts that will help to add multiples of 10

3 + 4 = 7

⇔

3 tens + 4 tens = 7 tens ✓

2 + 6 = 8

⇔

20 + 60 = 80 ✓

5 + 4 = 9

⇔

50 + 40 = 90 ✓
What could we do to help solve this equation? 32 + 40 =

Add 3 tens and 4 tens ✓

Add 3 tens and 2 tens

Add 2 tens and 4 tens
27 + 50 = ______

'77' ✓

Worksheet

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Lesson Details

Key learning points

When adding multiples of ten to a two-digit number, the tens digit changes but the ones digit stays the same.
Number facts can be used to help add and subtract multiples of ten to and from a two-digit number.

Common misconception

Children may automatically count on in tens to add a multiple of ten.

Discuss efficiency and compare different methods. Use practical equipment to draw attention to the relationship between adding multiples of ten in two-digit numbers and the known facts they already possess.

Keywords

Multiples of ten - The numbers that are said when we count on in tens from zero. Multiples of ten always have a ones digit of zero.
Recombine - To add the parts of a number gained through partitioning the whole to reach the whole amount again.