Adding Two-Digit Numbers with Rekenreks

To add two-digit numbers, first add the ones (regrouping if necessary) and then add the tens. To add 24 + 38, start by moving 4 beads and another 8 beads. Notice the moved beads can be regrouped as 1 ten and 2 ones. Finally, move 2 tens and 3 tens. There are 6 tens and 2 ones, so 24 + 38 = 62.

Adding Two-Digit Numbers using the Brainingcamp Rekenreks virtual manipulative.

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