m22878 To be able to do mental arithmetic 1.1 2009/05/03 08:14:02.651 GMT-5 2009/05/03 08:22:36.487 GMT-5 Helen Saayman Helen Saayman mark.horner@shuttleworthfoundation.org Helen Saayman Helen Saayman mark.horner@shuttleworthfoundation.org Helen Saayman Helen Saayman mark.horner@shuttleworthfoundation.org Mathematics and Statistics en

1.1 24 1.2 34 1.3 200 1.4 30 1.5 111 1.6 8 1.7 180 1.8 298 1.9 35 1.10 995 1.11 42 1.12 72 1.13 132 1.14 8 1.15 6 1.16 7 1.17 72 1.18 9 1.19 318 1.20 342

1. Before we look at more methods of subtraction, you have another chance to improve your mental arithmetic skills. Complete the following as quickly as you can. 1.1 38 – 14 = _________________ 1.2 68 – 34 = _________________ 1.3 _________________ – 101 = 99 1.4 110 – _________________ = 80 1.5 _________________ – 32 = 79 1.6 17 + _________________ = 25 1.7 260 + _________________ = 440 1.8 310 – 5 – 7 = _________________ 1.9 400 – 15 – _________________ = 350 1.10 1 004 – 9 = _________________ 1.11 6 × 7 = _________________ 1.12 8 × 9 = _________________ 1.13 12 × 11 = _________________ 1.14 48 ÷ 6 = _________________ 1.15 54 ÷ 9 = _________________ 1.16 _________________ × 7 = 49 1.17 _________________ ÷ 6 = 12 1.18 81 ÷ _________________ = 9 1.19 Double 159: _________________ 1.20 Halve 684: _________________ Colour in the appropriate block: My mental calculation marks have IMPROVED My mental calculation marks have IMPROVED DETERIORATED REMAINED THE SAME

Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems. Assessment Standard 1.9: We know this when the learner performs mental calculations.