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May 2013

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How to help students with multiplication tables?

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(easy hangman)
(difficult)

The ideas in this addition lesson are taken from Add & Subtract 2-B ebook. Only a few examples of each problem type are shown; you should make more problems of each kind for the student.

Add or subtract whole tens mentally
Free lesson plan from Homeschool Math.net

Adding ten to any number is easy. Look at the pictures.

	+		=
32	+	10	=	42

	+		=
54	+	10	=	64

	+		=
__	+	10	=	__

	+		=
__	+	10	=	__

The _________ digit does not change.

Look at the pictures. Cross out as many ten-pillars as the problem indicates. What is left?

30 10 = 20

40 20 = __

50 30 = __

70 40 = __


33 10 = 23


47 20 = __


26 10 = __


55 30 = __

The ___________ digit does not change.

Example problem types

1. Make an addition sentence that fits the picture. Draw more ten-pillars and one-squares to the answer picture.

	+		=
__	+	__	=	__

	+		=
__	+	__	=

2. Remember, you can add both ways. 52 + 10 is the same as 10 + 52.

10 + 34 = __

18 + 10 = __

10 + 15 = __

10 + 45 = __

30 + 40 = __

30 + 45 = __

55 + 30 = __

30 + 62= __

3. Add 10 each time. Add 20 each time. Add 30 each time.

+ 10

+ 30

4. Subtract. Compare the problems.

40 10 = __

4 1 = __

50 20 = __

5 2 = __

60 30 = __

6 3 = __

80 20 = __

8 2 = __

5. Subtract whole tens.

40 20 = __

90 10 = __

80 40 = __

90 30 = __

60 10 = __

70 30 = __

60 50 = __

90 60 = __

50 20 = __

6. Count by tens backwards:

100, 90, ___, ___, ___, ___, ___

78, 68, ___, ___, ___, ___, ___

76, 66, ___, ___, ___, ___

___, ___, ___, 54, 44, ___

95, 85, ___, ___, ___, ___, ___

___, ___, ___, 63, 53, ___, ___

70, 60, ___, ___, ___, ___

87, 77, ___, ___, ___, ___

7. Fill in the missing minuends.

__ 10 = 45

__ 10 = 67

__ 10 = 22

__ 10 = 55

__ 10 = 18

__ 30 = 36

__ 40 = 52

__ 50 = 49

__ 40 = 21

__ 50 = 17

8. Find the pattern and continue it.

88 10 = __

88 20 = __

88 30 = __

88 __ = __

__ __ = __

34 10 = __

44 20 = __

54 30 = __

__ __ = __

What numbers can go into the puzzles? All numbers are less than 100
(or can be 0). Are there many solutions or just one?

	+		=	90			=	40
					+	+
	+		=	30			=	30
= 30		= 30			= 80	= 10

Continue to Fact families

New! Times Tales is now on DVD!

The fast, FUN, and easy way to learn multiplication. Learn the upper times tales in two sittings using mnemonic stories.

Add or subtract whole tens mentally Free lesson plan from Homeschool Math.net

Example problem types

Add or subtract whole tens mentally
Free lesson plan from Homeschool Math.net