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What is place value? Place value is a positional system of notation in which the position of a number with respect to a point determines its value. The decimal numeration system is based on base 10. Each position in a number has a value that is a power of 10. • http://www.linkslearning.org/Kids/1_ Math/2_Illustrated_Lessons/3_Place _Value/index.html Some resources you might see being used http://www.teachers.tv/video/1435 Teaching place value http://www.teachers.tv/video/1436 Parents workshop http://www.teachers.tv/video/37862 Calculation lesson Some games to play: Guess my number-helps understanding of less/more than and use of 100 grid Higher or Lower! • This is a place value game which can be played with the whole family. • In pairs (to develop social / speaking-listening skills) draw 4 joined boxes in a horizontal line. Squared paper will help. The ‘teacher’ has a standard pack of playing cards with the jester cards removed. They shuffle them, turn the top card and call out the number. The others must choose a box to write this number in. The cards are turned and called until all four boxes are filled. • Then display and say the number. People who get a higher number than the ‘teacher’ gets 5 points. Equal to the teacher gets 3 points. Lower than the teacher 1 point. The teacher gets 10 points if he / she beats all the others! • Matching numbers to their number names. • Matching numbers to their tens and units: 156-how many tens, how many units etc. • Ordering numbers. Order even and odd numbers. Order numbers from 20-35 etc. Time themselves. • http://www.bbc.co.uk/schools/ks1bitesize/numera cy/units/index.shtml Place Value Call out the number before the answer appears. When you see it , say it! First look at the tens digit. Two tens are twenty! Next look at the units digit. Five units are 5. Two tens and Five units = 25 Now it’s your turn, but remember: When you see it, SAY IT! Well Done! You have worked hard reading two-digit numbers, now have a go at reading three-digit numbers. Once you know place value, you will find partitioning numbers a lot easier. What strategies would you use to add 2 two-digit numbers quickly? • This is one way to do it. • Split the tens. • Split the units. • Count on. 72+15= • Split the tens. • 70 + 10= 80 • 80+2=82 • 82+5= 87 Split the units. 43+56= • Split the tens. • 40 + 50= 90 • 90+3=93 • 93+6= 99 Split the units. 143+234= • Split the hundreds. Split the tens. Split the units. • • • • • 100 + 200= 300 300+40=340 340+30=370 370+3=373 373+4= 377 Work out the answers before the questions disappear! 21+63= 84 45+51= 96 231+642= 873 How well did you get on?