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# Activity 2: Adding and Subtracting

This activity may be used independently, in pairs, or as a class activity on a range of digital devices such as an interactive whiteboard, laptop, i-pad, etc.

The purpose of this activity is to recognise and order numbers from 1 to 100, and to practice addition and subtraction facts by using the hundreds board as a number line.

Using the hundreds board, students could be asked to:

Show how to add or subtract the tens first by counting up or down, then the ones by counting left or right.
2. Look for addition and subtraction patterns.
Ask the students to find 4+9, 14+9, 24+9, 34+9, 64+9. Describe the pattern.
15-7, 25-7, 45-7, etc. describe what these answers have in common. Find other patterns.
3. Play Bingo.
The teacher calls problems and students select answers until a row or column is filled and student calls 'Bingo'.
1. A 5x5 square is selected and outlined to produce the bingo board.
2. Example set of questions for board with a 5 by 5 square beginning at 1:
 6 + 5 16 - 1 5 more than 40 19 - 6 3 less than 34 45 - 2 18 + 5 3 + 0 42 + 2 How many tens in 53 28 + 5 10 – 9 7 + 5 11 + 11 Place value of 4 in 34 12 + 13 13 - 11 8 more than 6 21 + 21 10 less than 51 31 + 4 12 + 12 25 – 4 16 + 16 6 less than 40
1. Example set of questions for board with a 5 by 5 square beginning at 15:
 13 + 13 7 + 8 9 more than 8 20 + 18 3 less than 40 50 - 3 54 + 5 5 less than 60 51 + 6 12 + 13 41 + 5 46 – 9 38 + 7 18 + 18 34 minus 7 26 + 2 68 - 11 6 more than 23 9 + 7 13 + 5 42 + 6 12 + 7 1 less than 50 47 + 9 7 more than 32
1. Example set of questions for board with a 5 by 5 square beginning at 40:
 20 + 21 84 - 1 3 more than 40 80 - 40 3 less than 66 57 - 3 68 + 5 80 + 0 41 + 1 Place value of 6 in 68 59 + 5 63 – 9 37 + 5 25 + 25 51 – 7 71 + 3 83 - 11 8 more than 74 20 + 50 10 less than 61 60 + 2 30 + 31 85 – 4 67 + 4 6 less than 90

Taumata 2 activity 2 (Word 2007, 721 KB)

Taumata 2 activity 2 (PDF, 67 KB)