Teacher answer key for all three versions of the Lesson 1 worksheet (place value to tens of thousands). Brief working and "look-fors" are included where they help marking. ULO1.
Main — "Counting the Big Gumnut Pile"
- a) two thousand, four hundred and eight b) ten thousand and sixty
- a) 6 320 b) 19 005
- a) 700 (seven hundred) b) 30 000 (thirty thousand)
- 8 367 = 8 000 + 300 + 60 + 7
- 925, 5 020, 5 200, 12 100
- Largest 7 530; smallest 3 057. Look for: a leading 0 is not allowed for the smallest, so 0 goes in the tens/hundreds, not the front.
Support — "Place value with a helping chart"
- Thousands 2, Hundreds 4, Tens 6, Ones 3.
- a) fifty (1 250 = one thousand, two hundred and fifty) b) three thousand, four hundred
- 2 106
- a) 540 b) 2 300
Extension — "Bigger numbers and reasoning"
- a) forty-six thousand, three hundred and nine b) eighty thousand and seventy
- a) 5 000 b) 50 000. Look for: in 55 200 the first 5 is 50 000 and the second is 5 000; answer asks the value of each named 5.
- Largest 96 310; smallest 10 369. Reasoning: biggest digit in the highest place for largest; smallest non-zero digit leads for smallest.
- 24 thousands, 18 hundreds, 5 tens, 12 ones → 24 000 + 1 800 + 50 + 12 = 25 862. Look for: students must trade the over-9 columns up.
- Any two of 30 020, 30 040, 30 063 (tens digit double the ones, other digits 0, between 30 000–40 000). E.g. 30 021, 30 042, 30 063, 30 084.