2. 1 Addition & Subtraction Stage 4 Years 7 & 8 Press Ctrl-A ©2009 G Dear – Not to be sold/Free to use

3. 2 aligned 1. Write decimals under each other with decimal points aligned. zeros 2. Write zeros in empty decimal places. Addsubtractlike 3. Add or subtract like whole numbers. End of Slide

4. 3 0 E.g. 3.401 + 5.33 + 2.7 3.4015.33 +2.7 0 0 1 34 1.11 End of Slide

5. 4 g) 5.58 + 0.733=6.313 h) 6.5 + 0.999=7.499 i) 8.377 + 0.34=8.717 j) 2.121 + 1.09=3.211 k) 12.7 + 11.45=24.15 l) 100.5 + 0.65=101.15 a) 4.3 + 2.5=6.8 b)7.11 + 0.4=7.15 c) 3.321 + 1.41=4.731 d)0.62 + 0.125=0.645 e)5.7 + 3.131 =9.831 f)7.51 + 2.022=9.532 Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer To see the answer click on any coloured disk. End of Slide

6. 5 1 E.g. 3.401 - 2.7 3.401 - 2.7 0 0 0 1 2 7.0 End of Slide

7. 6 g) 5.58 - 0.733=4.847 h) 6.5 - 0.999=9.501 i) 8.377 - 0.34=8.037 j) 2.121 - 1.09=1.031 k) 12.7 - 11.45=1.25 l) 100.5 - 0.65=99.85 a) 4.3 - 2.5=1.8 b)7.11 - 0.4=6.71 c) 3.321 - 1.41=1.911 d)0.62 - 0.125=0.495 e)5.7 - 3.131 =2.569 f)7.51 - 2.022=5.488 Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer To see the answer click on any coloured disk. End of Show