How would you tackle these calculations

1
How would you tackle these calculations?

• 23 9
• 34 13 60 27 16
• 4353 857
• 2003 1998

OHT 3.1
2
Considering how you did the calculations

• How did you work out each calculation?
• What different methods were used?
• Which do you think is the easiest?

OHT 3.2
3
How would you tackle these calculations?

• Working out totals
• 15 27 25
• 24 37 18 26 13
• 2.54 2.67 1.46
• 8.7 5.6 6.7

OHT 3.3
4
Working out the totals

• 47 76
• (40 7) (70 6)
• (40 70) (7 6)
• 110 13 123
• or
• 47 70 117
• 117 6 123

125 238 (100 20 5) (200 30 8)
(100 200) (20 30) (5 8) 300 50
13 363
OHT 3.4
5
Horizontal recording

• 17 3
• 45 x 2
• 254 55
• 83 7

OHT 3.5
6
Vertical and horizontal recording

• 365
• 99
• 365 99

OHT 3.6
7
Target board
OHT 3.7