Match the vocabulary word with its definition.

• expanded form

• A set of steps that works every time as long as the steps are carried out correctly.

• algorithm

• A specific way of writing a number as a sum of hundreds, tens, and ones.

  Example: 482 = 400+80+2

• rounding

• A formal way to say which number a given number is closer to. For example, for 182, the number 180 is the closest multiple of ten and 200 is the closest multiple of a hundred.

445 + 160 > 500.

• True

• False

Answer explanation

445 + 160 = 605

235 + 215 < 400.

• True

• False

Answer explanation

235 + 215 = 450

535 + 215 > 800.

• True

• False

Answer explanation

535 + 215 = 750

235 + 215 < 500.

• True

• False

Answer explanation

235 + 215 = 450

385 + 412 > 700.

• True

• False

Answer explanation

385 + 412 = 797

532 + 165 < 700.

• True

• False

Answer explanation

532 + 165 = 697

Adrian has 142 collector cards. He sells 39 of them. Then, he buys 92 more. He estimates he has about 200 cards now. Do you agree or disagree?

• Agree

• Disagree

Answer explanation

Jade has 387 collector cards. She gave 105 cards to a friend. Then, her sister gave her 88 more cards. Estimate to the nearest hundred how many cards Jade has now.

Answer explanation

Match each tape diagram to one of the following equations

a

b

385 + (2 x 7)

385 + (5 x 6)