Number Detectives Sanjay’s number has three tens and five ones. What number does Sanjay have? Isabelle’s number has two tens more than Sanjay’s number.

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Presentation transcript:

Number Detectives Sanjay’s number has three tens and five ones. What number does Sanjay have? Isabelle’s number has two tens more than Sanjay’s number. What number does Isabelle have? I have 35 I have 55

Number Detectives My number has four tens. Which numbers could it be? Give three examples. Which numbers can’t it be? Give three examples. Numbers it could be: 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 140, 141, 142, etc Numbers it can’t be: Any number without a 4 in the tens value

Number Detectives You can take 100 away from any three-digit number and still have a three digit number. Is she correct? Explain your answer. Ava is wrong. 132 – 100 = 32

When you add ten to any number, the ones always stay the same Number Detectives When you add ten to any number, the ones always stay the same Is he right? Explain your answer. Habib is correct. The ones do not change when you add a multiple of 10 to any number e.g. 7, 17, 27, 37, 47, 57 etc.

Number Detectives Faith has 27 ones and Jessica has two tens and 9 ones. Who has the largest number? Explain your answer. I have 27. I have the smallest number. I have the largest number. I have two tens and 9 ones I have 29. I have 27 ones.

Number Detectives Chen has four tens and 7 ones. He gives 20 to his friend. I still have a number higher than 30 Is he correct? Explain your answer. 47 – 20 = 27. He is wrong, this is not higher than 30.

Number Detectives Isla has 32p. She gets 7 lots of 10p for her birthday. I have more than £1. Is she correct? Explain your answer. 32p + 70p = £1.02 so she is correct.